Ensure that all numbered lists use only 1. and no other numbers.
Also ensure that numbered lists use proper spacing.

Markdown renderers find it easier to determine
where lists start and end when lists are surrounded
by new lines.

For consistency, also ensure entries in the list
are aligned when they span multipls lines.

For the sake of consistency, removes any extraneous
consecutive blank lines from the doc suite.

This helped me troubleshoot
https://gitlab.com/gitlab-org/gitlab-ee/issues/9727#note_141202527.

- Also makes other minor Markdown fixes that were near the main fixes.