[std] Replace 'this standard' with 'this document'

Fixes ISO/CS comment (C++23 proof)

Author: jensmaurer

source/compatibility.tex

@@ -190,7 +190,7 @@
 \change
 Remove header \libnoheader{codecvt} and all its contents.
 \rationale
-The header has been deprecated for the previous three editions of this standard
+The header has been deprecated for the previous three editions of this document
 and no longer implements the current Unicode standard, supporting only the
 obsolete UCS-2 encoding.
 Ongoing support is at implementer's discretion,
@@ -234,7 +234,7 @@
 \tcode{wbuffer_convert}.
 \rationale
 These features were underspecified with no clear error reporting mechanism and
-were deprecated for the last three editions of this standard.
+were deprecated for the last three editions of this document.
 Ongoing support is at implementer's discretion,
 exercising freedoms granted by \ref{zombie.names}.
 \effect

source/future.tex

@@ -4,8 +4,8 @@
 \rSec1[depr.general]{General}
 
 \pnum
-This Annex describes features of the \Cpp{} Standard that are specified for compatibility with
-existing implementations.
+This Annex describes features of this document
+that are specified for compatibility with existing implementations.
 
 \pnum
 These are deprecated features, where