GitLab

Added a missing newline

The Optional() matcher is otherwise undocumented except in the source.
This patch adds it to the cheat sheet for better visibility.

Removed "Documentation.md" not adding value and not consitent with internal docs

Rename AdvancedGuide.md to advanced.md and adjust the links. 
Part of documentation rationalization work

move only types docs

Per the review comments.

The documentation of former versions is available in the history (e.g.
by checking out the appropriate git tags), so there is no need to keep
them in parallel to the current documentation.

The document itself uses lambdas later, all the scaffolding to
work around lack of lambdas should be considered for removal, but
that is much larger an effort than I can commit to.

The markdown was not working for a small table, fixed.

Add a hyphen to 'ad hoc' and change 'distance' to plural.

SeArrayArgument => SetArrayArgument

The old language might mislead someone into thinking that the access level on the base class itself was changed.

Put occurrences of "#include" in a code span so they are not interpreted
as headers.

Other documents were not broken because the #include was not at the
start of the line, but put them in code spans anyway just in case the
text gets refilled in the future.