docs/devel: rename plugins.rst to tcg-plugins.rst

This makes it a bit clearer what this is about.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

MAINTAINERS

@@ -2371,6 +2371,7 @@ F: tcg/
 TCG Plugins
 M: Alex Bennée <alex.bennee@linaro.org>
 S: Maintained
+F: docs/devel/tcg-plugins.rst
 F: plugins/
 F: tests/plugin
 

docs/devel/index.rst

@@ -22,4 +22,4 @@ Contents:
    decodetree
    secure-coding-practices
    tcg
-   plugins
+   tcg-plugins