docs: move gcc-plugins to the kbuild manual

Information about GCC plugins is relevant to kernel building, so move this
document to the kbuild manual.

Acked-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/core-api/index.rst b/Documentation/core-api/index.rst
index b39dae2..9836a0a 100644
--- a/Documentation/core-api/index.rst
+++ b/Documentation/core-api/index.rst
@@ -102,7 +102,6 @@
    :maxdepth: 1
 
    librs
-   gcc-plugins
    ioctl
 
 .. only:: subproject and html
diff --git a/Documentation/core-api/gcc-plugins.rst b/Documentation/kbuild/gcc-plugins.rst
similarity index 100%
rename from Documentation/core-api/gcc-plugins.rst
rename to Documentation/kbuild/gcc-plugins.rst
diff --git a/Documentation/kbuild/index.rst b/Documentation/kbuild/index.rst
index 0f144fa..82daf2e 100644
--- a/Documentation/kbuild/index.rst
+++ b/Documentation/kbuild/index.rst
@@ -19,6 +19,7 @@
 
     issues
     reproducible-builds
+    gcc-plugins
 
 .. only::  subproject and html
 
diff --git a/MAINTAINERS b/MAINTAINERS
index 083fcf1..8c57120 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6934,7 +6934,7 @@
 F:	scripts/gcc-plugins/
 F:	scripts/gcc-plugin.sh
 F:	scripts/Makefile.gcc-plugins
-F:	Documentation/core-api/gcc-plugins.rst
+F:	Documentation/kbuild/gcc-plugins.rst
 
 GASKET DRIVER FRAMEWORK
 M:	Rob Springer <rspringer@google.com>
diff --git a/scripts/gcc-plugins/Kconfig b/scripts/gcc-plugins/Kconfig
index e356954..f8ca236 100644
--- a/scripts/gcc-plugins/Kconfig
+++ b/scripts/gcc-plugins/Kconfig
@@ -23,7 +23,7 @@
 	  GCC plugins are loadable modules that provide extra features to the
 	  compiler. They are useful for runtime instrumentation and static analysis.
 
-	  See Documentation/core-api/gcc-plugins.rst for details.
+	  See Documentation/kbuild/gcc-plugins.rst for details.
 
 if GCC_PLUGINS