c: Do not document C23 support as experimental and incomplete

Since C23 support is substantially feature-complete, update
documentation to no longer refer to it as experimental and incomplete.

Bootstrapped with no regressions for x86_64-pc-linux-gnu.

gcc/
	* doc/cpp.texi (__STDC_VERSION__): Do not refer to C23 support as
	experimental.
	* doc/invoke.texi (std=c23, std=gnu23): Do not document as
	experimental and incomplete.
	* doc/standards.texi: Do not refer to C23 support as experimental
	and incomplete.

gcc/c-family/
	* c.opt (std=c23, std=gnu23, std=iso9899:2024): Do not mark as
	experimental and incomplete.

4 files changed, 9 insertions, 11 deletions

diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt
index 3fd331c..e2c0108 100644
--- a/gcc/c-family/c.opt
+++ b/gcc/c-family/c.opt
@@ -2590,7 +2590,7 @@ Conform to the ISO 2017 C standard (published in 2018).
 
 std=c23
 C ObjC
-Conform to the ISO 2023 C standard draft (expected to be published in 2024) (experimental and incomplete support).
+Conform to the ISO 2023 C standard draft (expected to be published in 2024).
 
 std=c2x
 C ObjC Alias(std=c23)
@@ -2692,7 +2692,7 @@ Conform to the ISO 2017 C standard (published in 2018) with GNU extensions.
 
 std=gnu23
 C ObjC
-Conform to the ISO 2023 C standard draft (expected to be published in 2024) with GNU extensions (experimental and incomplete support).
+Conform to the ISO 2023 C standard draft (expected to be published in 2024) with GNU extensions.
 
 std=gnu2x
 C ObjC Alias(std=gnu23)
@@ -2748,7 +2748,7 @@ Conform to the ISO 2017 C standard (published in 2018).
 
 std=iso9899:2024
 C ObjC Alias(std=c23)
-Conform to the ISO 2023 C standard draft (expected to be published in 2024) (experimental and incomplete support).
+Conform to the ISO 2023 C standard draft (expected to be published in 2024).
 
 stdlib=
 Driver C++ ObjC++ Common Condition(ENABLE_STDLIB_OPTION) Var(flag_stdlib_kind) Joined Enum(stdlib_kind) RejectNegative Init(1)
diff --git a/gcc/doc/cpp.texi b/gcc/doc/cpp.texi
index db3a075..a83aa26 100644
--- a/gcc/doc/cpp.texi
+++ b/gcc/doc/cpp.texi
@@ -1887,7 +1887,7 @@ the 1999 revision of the C standard; the value @code{201112L}
 signifies the 2011 revision of the C standard; the value
 @code{201710L} signifies the 2017 revision of the C standard (which is
 otherwise identical to the 2011 version apart from correction of
-defects).  The value @code{202311L} is used for the experimental
+defects).  The value @code{202311L} is used for the
 @option{-std=c23} and @option{-std=gnu23} modes.  An unspecified value
 larger than @code{202311L} is used for the experimental
 @option{-std=c2y} and @option{-std=gnu2y} modes.
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 07920e0..19c148a 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -2480,8 +2480,7 @@ applied with @option{-std=c11}) and a new value of
 @itemx c2x
 @itemx iso9899:2024
 ISO C23, the 2023 revision of the ISO C standard (expected to be
-published in 2024).  The support for this version is experimental and
-incomplete.  The name @samp{c2x} is deprecated.
+published in 2024).  The name @samp{c2x} is deprecated.
 
 @item c2y
 The next version of the ISO C standard, still under development.  The
@@ -2506,8 +2505,7 @@ GNU dialect of ISO C17.  This is the default for C code.
 
 @item gnu23
 @itemx gnu2x
-GNU dialect of ISO C23.  The support for this version is experimental
-and incomplete.  The name @samp{gnu2x} is deprecated.
+GNU dialect of ISO C23.  The name @samp{gnu2x} is deprecated.
 
 @item gnu2y
 The next version of the ISO C standard, still under development, plus
diff --git a/gcc/doc/standards.texi b/gcc/doc/standards.texi
index 484fbb1..4ef28e9 100644
--- a/gcc/doc/standards.texi
+++ b/gcc/doc/standards.texi
@@ -115,10 +115,10 @@ known as @dfn{C17} and is supported with @option{-std=c17} or
 @option{-std=c11}, and the only difference between the options is the
 value of @code{__STDC_VERSION__}.
 
-A fifth version of the C standard, known as @dfn{C23}, is under
-development and expected to be published in 2024 as ISO/IEC 9899:2024.
+A fifth version of the C standard, known as @dfn{C23}, is
+expected to be published in 2024 as ISO/IEC 9899:2024.
 (While in development, drafts of this standard version were referred
-to as @dfn{C2X}.)  Experimental and incomplete support for this is
+to as @dfn{C2X}.)  Support for this is
 enabled with @option{-std=c23} or @option{-std=iso9899:2024}.
 
 A further version of the C standard, known as @dfn{C2Y}, is under