Fix some Texinfo markup in manuals

* doc/emacs/macos.texi (Mac / GNUstep Customization):
* doc/lispintro/emacs-lisp-intro.texi (condition-case):
* doc/lispref/control.texi (pcase Macro):
* doc/lispref/debugging.texi (Internals of Debugger):
* doc/lispref/internals.texi (Building Emacs):
* doc/lispref/modes.texi (Imenu):
(Parser-based Font Lock, Parser-based Indentation):
* doc/lispref/parsing.texi (Retrieving Nodes, Tree-sitter C API):
* doc/lispref/processes.texi (Network, Bindat Types):
* doc/lispref/searching.texi (Rx Functions):
* doc/lispref/text.texi (Replacing):
* doc/lispref/windows.texi (Textual Scrolling):
* doc/misc/calc.texi (Killing From Stack, Customizing Calc):
* doc/misc/cc-mode.texi (Misc Font Locking, List Line-Up):
* doc/misc/ede.texi (ede-cpp-root-project)
(ede-proj-target-makefile, ede-sourcecode):
* doc/misc/ert.texi (Running Tests in Batch Mode):
* doc/misc/eudc.texi (Emacs-only Configuration, The Server Hotlist):
* doc/misc/eww.texi (Advanced):
* doc/misc/flymake.texi (Starting Flymake)
(Proc customization variables):
* doc/misc/tramp.texi (File name completion):
* doc/misc/gnus.texi (Summary Buffer Lines, Gnus Registry Setup)
(Fancy splitting to parent, Customizing the IMAP Connection)
(Mail Source Specifiers, Agent as Cache): Consistently mark up nil
and t as @code.  Also fix the markup and wording of some surrounding
text (bug#64016).

* doc/lispref/display.texi (SVG Images, Icons):
* doc/lispref/modes.texi (Customizing Keywords): Prefer ASCII
apostrophe over Unicode right single quotation mark.

1 files changed, 4 insertions, 4 deletions

diff --git a/doc/lispref/parsing.texi b/doc/lispref/parsing.texi
index b70f953f8ed..7e77af0a5cf 100644
--- a/doc/lispref/parsing.texi
+++ b/doc/lispref/parsing.texi
@@ -656,7 +656,7 @@ it, or query for information about this node.
 This function returns the immediate parent of @var{node}.
 
 If @var{node} is more than 1000 levels deep in a parse tree, the
-return value is undefined.  Currently it returns @var{nil}, but that
+return value is undefined.  Currently it returns @code{nil}, but that
 could change in the future.
 @end defun
 
@@ -842,7 +842,7 @@ the number of levels to go down from @var{root}.  If @var{depth} is
 
 Each node in the returned tree looks like
 @w{@code{(@var{tree-sitter-node} . (@var{child} @dots{}))}}.  The
-@var{tree-sitter-node} of the root of this tree will be nil if
+@var{tree-sitter-node} of the root of this tree will be @code{nil} if
 @var{root} doesn't match @var{predicate}.  If no node matches
 @var{predicate}, the function returns @code{nil}.
 @end defun
@@ -866,7 +866,7 @@ the argument and returns a boolean that indicates a match.  If no
 parent satisfies @var{pred}, this function returns @code{nil}.
 
 Normally this function only looks at the parents of @var{node} but not
-@var{node} itself. But if @var{include-node} is non-@var{nil}, this
+@var{node} itself.  But if @var{include-node} is non-@code{nil}, this
 function returns @var{node} if @var{node} satisfies @var{pred}.
 @end defun
 
@@ -1880,7 +1880,7 @@ convenient and idiomatic:
 Instead of using byte positions, the Emacs Lisp API uses character
 positions.
 @item
-Null nodes are converted to nil.
+Null nodes are converted to @code{nil}.
 @end itemize
 
 Below is the correspondence between all C API functions and their