ci: disallow some common capitalization mistakes (#2472)

* ci: only annotate linux for now

* style: block some common mistakes
diff --git a/docs/faq.rst b/docs/faq.rst
index b685629..5f7866f 100644
--- a/docs/faq.rst
+++ b/docs/faq.rst
@@ -285,7 +285,7 @@
 Python detection in a system with several Python versions installed.
 
 This difference may cause inconsistencies and errors if *both* mechanisms are used in the same project. Consider the following
-Cmake code executed in a system with Python 2.7 and 3.x installed:
+CMake code executed in a system with Python 2.7 and 3.x installed:
 
 .. code-block:: cmake