doc: Final, pre-release fixes and updates

A small set of misc changes to ensure correctness before the v2.2
release tagging.

Change-Id: I888840b9483ea1a1633d204fbbc0f9594072101e
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
diff --git a/.editorconfig b/.editorconfig
index b14e025..f523ca1 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -54,13 +54,10 @@
 trim_trailing_whitespace = true
 
 
-# Adjustment for existing .rst files with different format
-[*.{rst,md}]
+# Adjustment for ReStructuredText (RST) documentation
+[*.{rst}]
 indent_size = 4
 indent_style = space
-max_line_length = 180
-# 180 only selected to prevent changes to existing text.
-tab_width = 4
 
 
 # Adjustment for python which prefers a different style