[PATCH] docs: kconfig: fix shell function syntax in caveats

[Erkan Erdem <hexvalid@gmail.com>]

Kconfig separates a function name from its arguments with a comma, but
the caveats section uses Make-style whitespace in its shell calls.
These expressions expand as undefined variables rather than invoking
the shell function, so the supposedly working CC_HAS_ENDIAN_FLAG
example fails to parse.

Add the missing commas to the shell calls in this section. Keep the
Make examples unchanged.

Fixes: 316d55d55f49 ("Documentation: kconfig: document a new Kconfig macro language")
Assisted-by: LLM
Signed-off-by: Erkan Erdem <hexvalid@gmail.com>
---

The issue was found and this patch and changelog were prepared with an AI
coding assistant after a request to find a small, verifiable Linux fix.
The assistant also prepared and ran the verification described below.

Validation:
- Built the current Kconfig conf tool on macOS with Clang, Bison and Flex,
  using -Wall -Wmissing-prototypes -Wstrict-prototypes -Werror.
- Extracted the documented working CC_HAS_ENDIAN_FLAG example into a
  minimal Kconfig, with a test gcc-check-flag helper returning y for either
  endian flag. Before: syntax errors and no helper invocations for either
  CPU endianness. After: both probes execute and CC_HAS_ENDIAN_FLAG=y.
- Built the changed page alone with Sphinx, treating warnings as errors.
  The complete kernel documentation set and kernel were not built.

 Documentation/kbuild/kconfig-macro-language.rst | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Documentation/kbuild/kconfig-macro-language.rst b/Documentation/kbuild/kconfig-macro-language.rst
index 6163467f..e15af278 100644
--- a/Documentation/kbuild/kconfig-macro-language.rst
+++ b/Documentation/kbuild/kconfig-macro-language.rst
@@ -225,7 +225,7 @@ not work::
             $(MY_TYPE) "foo"
             default y
 
-Obviously from the design, $(shell command) is expanded in the textual
+Obviously from the design, $(shell,command) is expanded in the textual
 substitution phase. You cannot pass symbols to the 'shell' function.
 
 The following does not work as expected::
@@ -236,12 +236,12 @@ The following does not work as expected::
             default "-mlittle-endian" if CPU_LITTLE_ENDIAN
 
     config CC_HAS_ENDIAN_FLAG
-            def_bool $(shell $(srctree)/scripts/gcc-check-flag ENDIAN_FLAG)
+            def_bool $(shell, $(srctree)/scripts/gcc-check-flag ENDIAN_FLAG)
 
 Instead, you can do like follows so that any function call is statically
 expanded::
 
     config CC_HAS_ENDIAN_FLAG
             bool
-            default $(shell $(srctree)/scripts/gcc-check-flag -mbig-endian) if CPU_BIG_ENDIAN
-            default $(shell $(srctree)/scripts/gcc-check-flag -mlittle-endian) if CPU_LITTLE_ENDIAN
+            default $(shell, $(srctree)/scripts/gcc-check-flag -mbig-endian) if CPU_BIG_ENDIAN
+            default $(shell, $(srctree)/scripts/gcc-check-flag -mlittle-endian) if CPU_LITTLE_ENDIAN

base-commit: 4d7d9486c04d917265f64c55bd23b2cc4fe7749c
-- 
2.50.1 (Apple Git-155)