docs: automarkup.py: Skip common English words as C identifiers

The automarkup extension incorrectly recognizes common English words
as C identifiers when they follow struct/union/enum/typedef keywords,
causing normal text like "... (a simple) struct that" (in `workqueue.rst`)
to be rendered as code blocks.

This patch adds Skipidentifiers list to filter out these words.

Signed-off-by: Yulong Han <wheatfox17@icloud.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260125124450.2005006-1-wheatfox17@icloud.com>

Author: enkerewpo

Documentation/sphinx/automarkup.py

@@ -46,6 +46,12 @@
 #
 Skipnames = [ 'for', 'if', 'register', 'sizeof', 'struct', 'unsigned' ]
 
+#
+# Common English words that should not be recognized as C identifiers
+# when following struct/union/enum/typedef keywords.
+# Example: "a simple struct that" in workqueue.rst should not be marked as code.
+#
+Skipidentifiers = [ 'that', 'which', 'where', 'whose' ]
 
 #
 # Many places in the docs refer to common system calls.  It is
@@ -163,6 +169,10 @@ def markup_c_ref(docname, app, match):
     if c_namespace:
         possible_targets.insert(0, c_namespace + "." + base_target)
 
+    # Skip common English words that match identifier pattern but are not C code.
+    if base_target in Skipidentifiers:
+        return target_text
+
     if base_target not in Skipnames:
         for target in possible_targets:
             if not (match.re == RE_function and target in Skipfuncs):