Delete "new in Emacs 21" note.

2 files changed, 2 insertions, 3 deletions

diff --git a/lispref/display.texi b/lispref/display.texi
index 3b9ae8ee17e..bf36afa9029 100644
--- a/lispref/display.texi
+++ b/lispref/display.texi
@@ -861,7 +861,7 @@ or shorter, higher or lower, wider or narrower, or replaced with an image.
 If an overlay has a @code{help-echo} property, then when you move the
 mouse onto the text in the overlay, Emacs displays a help string in the
 echo area, or in the tooltip window.  For details see @ref{Text
-help-echo}.  This feature is available starting in Emacs 21.
+help-echo}.
 
 @item modification-hooks
 @kindex modification-hooks @r{(overlay property)}
diff --git a/lispref/text.texi b/lispref/text.texi
index bbbbb6eca82..615db2d0860 100644
--- a/lispref/text.texi
+++ b/lispref/text.texi
@@ -2739,8 +2739,7 @@ a string, it is evaluated to obtain a help string.
 You can alter the way help text is displayed by setting the variable
 @code{show-help-function} (@pxref{Help display}).
 
-This feature is used in the mode line and for other active text.  It is
-available starting in Emacs 21.
+This feature is used in the mode line and for other active text.
 
 @item keymap
 @cindex keymap of character