Fix styling of Unicode codepoints in manuals

* doc/lispref/nonascii.texi (Character Properties):
* doc/lispref/display.texi (Glyphless Chars)
(Bidirectional Display):
* doc/emacs/search.texi (Lax Search):
* doc/emacs/text.texi (Quotation Marks):
* doc/emacs/basic.texi (Inserting Text): Canonicalize the
style of "U+NNNN CHARACTER NAME".  (Bug#35885)

1 files changed, 7 insertions, 6 deletions

diff --git a/doc/emacs/search.texi b/doc/emacs/search.texi
index 004280cc64b..0da037330d4 100644
--- a/doc/emacs/search.texi
+++ b/doc/emacs/search.texi
@@ -1310,14 +1310,14 @@ of its accented cousins like @code{@"a} and @code{@'a}, i.e., the
 match disregards the diacritics that distinguish these
 variants.  In addition, @code{a} matches other characters that
 resemble it, or have it as part of their graphical representation,
-such as @sc{u+249c parenthesized latin small letter a} and @sc{u+2100
-account of} (which looks like a small @code{a} over @code{c}).
+such as U+249C @sc{parenthesized latin small letter a} and U+2100
+@sc{account of} (which looks like a small @code{a} over @code{c}).
 Similarly, the @acronym{ASCII} double-quote character @code{"} matches
 all the other variants of double quotes defined by the Unicode
 standard.  Finally, character folding can make a sequence of one or
 more characters match another sequence of a different length: for
-example, the sequence of two characters @code{ff} matches @sc{u+fb00
-latin small ligature ff}.  Character sequences that are not identical,
+example, the sequence of two characters @code{ff} matches U+FB00
+@sc{latin small ligature ff}.  Character sequences that are not identical,
 but match under character folding are known as @dfn{equivalent
 character sequences}.
 
@@ -1642,8 +1642,9 @@ replacement has already been made, @key{DEL} and @key{SPC} are
 equivalent in this situation; both move to the next occurrence.
 
 You can type @kbd{C-r} at this point (see below) to alter the replaced
-text.  You can also type @kbd{C-x u} to undo the replacement; this exits
-the @code{query-replace}, so if you want to do further replacement you
+text.  You can also undo the replacement with the @code{undo} command
+(e.g., type @kbd{C-x u}; @pxref{Undo}); this exits the
+@code{query-replace}, so if you want to do further replacement you
 must use @kbd{C-x @key{ESC} @key{ESC} @key{RET}} to restart
 (@pxref{Repetition}).