Simplify wording and add some formatting in several locations.
Expand sentinel array tests to highlight (non-)handling of internal
sentinels.
Fix format of symbol names in function pointers example.
Clarify wording a bit on the builin atomic* documentation.
Remove the (second) builtin compileLog example that demonstrated a lack of
compileLog entries.
* langref: address comments from rohlem
Use "0-terminated" instead of "null-terminated".
Undo some changes that were not as clear an improvement as I though.
* langref: remove stray ""
Thanks to rohlem for spotting this typo.
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