Minor improvements of next-error docs

* lisp/simple.el (next-error-find-buffer-function)
(previous-error, next-error-select-buffer): Doc fixes.
* doc/emacs/maintaining.texi (Change Log Commands):
* doc/emacs/building.texi (Compilation Mode): Index the new
commands and variables.  Improve wording.
(Bug#20493)

2 files changed, 11 insertions, 5 deletions

diff --git a/doc/emacs/building.texi b/doc/emacs/building.texi
index 1e2dac9534e..496c4275bc2 100644
--- a/doc/emacs/building.texi
+++ b/doc/emacs/building.texi
@@ -190,6 +190,9 @@ compilation buffer produce automatic source display.
 @item g
 Re-run the last command whose output is shown in the
 @file{*compilation*} buffer.
+@item M-x next-error-select-buffer
+Select a buffer to be used by next invocation of @code{next-error} and
+@code{previous-error}.
 @end table
 
 @kindex M-g M-n
@@ -212,6 +215,8 @@ the beginning of the compilation buffer, and visits the first locus.
   @kbd{M-g M-p} or @kbd{M-g p} (@code{previous-error}) iterates
 through errors in the opposite direction.
 
+@vindex next-error-find-buffer-function
+@findex next-error-select-buffer
   The @code{next-error} and @code{previous-error} commands don't just
 act on the errors or matches listed in @file{*compilation*} and
 @file{*grep*} buffers; they also know how to iterate through error or
diff --git a/doc/emacs/maintaining.texi b/doc/emacs/maintaining.texi
index 649ca1ec51f..df8c4479000 100644
--- a/doc/emacs/maintaining.texi
+++ b/doc/emacs/maintaining.texi
@@ -1640,14 +1640,15 @@ entry is considered a page.  This facilitates editing the entries.
 @kbd{C-j} and auto-fill indent each new line like the previous line;
 this is convenient for entering the contents of an entry.
 
-You can use the @code{change-log-goto-source} command (by default
+@findex change-log-goto-source
+  You can use the command @code{change-log-goto-source} (by default
 bound to @kbd{C-c C-c}) to go to the source location of the change log
 entry near point, when Change Log mode is on.  Then subsequent
 invocations of the @code{next-error} command (by default bound to
-@kbd{M-g M-n}) will move between entries in the change log.  You will
-jump to the actual site in the file that was changed, not just to the
-next change log entry.  You can also use @code{previous-error} to move
-back in the same list.
+@kbd{M-g M-n} and @kbd{C-x `}) will move between entries in the change
+log.  You will jump to the actual site in the file that was changed,
+not just to the next change log entry.  You can also use
+@code{previous-error} to move back through the change log entries.
 
 @findex change-log-merge
   You can use the command @kbd{M-x change-log-merge} to merge other