docs: some more minor updates

Fixes some errors and some stale references and formats.

Change-Id: I5a2f6d4a20591b61ae49eaab3310dc7abf51d83d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/14122
Reviewed-by: Keir Mierle <keir@google.com>
Commit-Queue: Ewout van Bekkum <ewout@google.com>
diff --git a/docs/style_guide.rst b/docs/style_guide.rst
index f39379f..104fe73 100644
--- a/docs/style_guide.rst
+++ b/docs/style_guide.rst
@@ -197,7 +197,7 @@
 ==================
 All loops and conditional statements must use braces.
 
-The syntax ``while (true)`` if preferred over ``for (;;)`` for infinite loops.
+The syntax ``while (true)`` is preferred over ``for (;;)`` for infinite loops.
 
 Include guards
 ==============