Correct `until`, note on `function`, grammar fixes

Added notes about the possible future distinction between `function` and `func`.

Fixed 2 misleading statements about whether or not the condition is met in `until`.

Minor grammar cleanups.

Added above to Document History.
Minor Grammar Fixes
Merge pull request #953 from WiseGenius/master

Correct `until`, note on `function`, grammar fixes
TESTS: Incremental improvement to run-all
FIX: issue #974 (RANDOM action not defined)
Merge pull request #977 from qtxie/issue-974

FIX: issue #974 (RANDOM action not defined)