Fix English grammar in some doc strings and comments

(files.el subr.el): Fix some grammar errors in doc strings and comments.
(frame.c fringe.c image.c xfns.c xterm.c): Fix some English grammar
errors in doc strings.

5 files changed, 12 insertions, 12 deletions

diff --git a/src/frame.c b/src/frame.c
index 8ca5106cb2a..486d025e6d6 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -6120,7 +6120,7 @@ which need to do mouse handling at the Lisp level.  */);
 
   DEFVAR_LISP ("mouse-highlight", Vmouse_highlight,
                doc: /* If non-nil, clickable text is highlighted when mouse is over it.
-If the value is an integer, highlighting is only shown after moving the
+If the value is an integer, highlighting is shown only after moving the
 mouse, while keyboard input turns off the highlight even when the mouse
 is over the clickable text.  However, the mouse shape still indicates
 when the mouse is over clickable text.  */);
diff --git a/src/fringe.c b/src/fringe.c
index 08bf271ed56..ded7c44e905 100644
--- a/src/fringe.c
+++ b/src/fringe.c
@@ -1716,8 +1716,8 @@ syms_of_fringe (void)
 
   DEFVAR_LISP ("overflow-newline-into-fringe", Voverflow_newline_into_fringe,
     doc: /* Non-nil means that newline may flow into the right fringe.
-This means that display lines which are exactly as wide as the window
-\(not counting the final newline) will only occupy one screen line, by
+This means that display lines that are exactly as wide as the window
+\(not counting the final newline) will occupy only one screen line, by
 showing (or hiding) the final newline in the right fringe; when point
 is at the final newline, the cursor is shown in the right fringe.
 If nil, also continue lines which are exactly as wide as the window.  */);
diff --git a/src/image.c b/src/image.c
index 08e420837a0..870f008b14f 100644
--- a/src/image.c
+++ b/src/image.c
@@ -1758,7 +1758,7 @@ DEFUN ("clear-image-cache", Fclear_image_cache, Sclear_image_cache,
        doc: /* Clear the image cache.
 FILTER nil or a frame means clear all images in the selected frame.
 FILTER t means clear the image caches of all frames.
-Anything else, means only clear those images which refer to FILTER,
+Anything else means clear only those images that refer to FILTER,
 which is then usually a filename.  */)
   (Lisp_Object filter)
 {
@@ -10055,7 +10055,7 @@ DEFUN ("init-image-library", Finit_image_library, Sinit_image_library, 1, 1, 0,
        doc: /* Initialize image library implementing image type TYPE.
 Return t if TYPE is a supported image type.
 
-If image libraries are loaded dynamically (currently only the case on
+If image libraries are loaded dynamically (currently the case only on
 MS-Windows), load the library for TYPE if it is not yet loaded, using
 the library file(s) specified by `dynamic-library-alist'.  */)
   (Lisp_Object type)
diff --git a/src/xfns.c b/src/xfns.c
index 20e63a26501..b1b40702c24 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -1,4 +1,4 @@
-/* Functions for the X window system.
+/* Functions for the X Window System.
 
 Copyright (C) 1989, 1992-2019 Free Software Foundation, Inc.
 
@@ -5351,8 +5351,8 @@ and width values are in pixels.
   FRAME.
 
 `outer-border-width' is the width of the X border of FRAME.  The X
-  border is usually only shown for frames without window manager
-  decorations like child and tooltip frames.  */)
+  border is usually shown only for frames without window manager
+  decorations, such as child and tooltip frames.  */)
   (Lisp_Object frame)
 {
   return frame_geometry (frame, Qnil);
@@ -5787,7 +5787,7 @@ DEFUN ("x-display-list", Fx_display_list, Sx_display_list, 0, 0, 0,
 
 DEFUN ("x-synchronize", Fx_synchronize, Sx_synchronize, 1, 2, 0,
        doc: /* If ON is non-nil, report X errors as soon as the erring request is made.
-This function only has an effect on X Windows.  With MS Windows, it is
+This function has an effect only on X Windows.  With MS Windows, it is
 defined but does nothing.
 
 If ON is nil, allow buffering of requests.
@@ -7365,9 +7365,9 @@ Use a file selection dialog.  Select DEFAULT-FILENAME in the dialog's file
 selection box, if specified.  If MUSTMATCH is non-nil, the returned file
 or directory must exist.
 
-This function is only defined on NS, MS Windows, and X Windows with the
+This function is defined only on NS, MS Windows, and X Windows with the
 Motif or Gtk toolkits.  With the Motif toolkit, ONLY-DIR-P is ignored.
-Otherwise, if ONLY-DIR-P is non-nil, the user can only select directories.
+Otherwise, if ONLY-DIR-P is non-nil, the user can select only directories.
 On MS Windows 7 and later, the file selection dialog "remembers" the last
 directory where the user selected a file, and will open that directory
 instead of DIR on subsequent invocations of this function with the same
diff --git a/src/xterm.c b/src/xterm.c
index 045589534fb..44fbd27b11a 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -13636,7 +13636,7 @@ baseline level.  The default value is nil.  */);
   DEFVAR_BOOL ("x-mouse-click-focus-ignore-position",
                x_mouse_click_focus_ignore_position,
     doc: /* Non-nil means that a mouse click to focus a frame does not move point.
-This variable is only used when the window manager requires that you
+This variable is used only when the window manager requires that you
 click on a frame to select it (give it focus).  In that case, a value
 of nil, means that the selected window and cursor position changes to
 reflect the mouse click position, while a non-nil value means that the