remove the "BETA FEATURE" flags from CDIST_ORDER_DEPENDENCY and CDIST_OVERRIDE.
asciidoc syntax fix
whitespace
wording
wording
typo
wording
expand "Dependencies" paragraph

Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>

Conflicts:
	docs/man/man7/cdist-manifest.text
remove the "BETA FEATURE" flags from CDIST_ORDER_DEPENDENCY and CDIST_OVERRIDE.