linkify internal <directive> tags

fix various invalid module references

fixups to quiet the latex build

Change RemoteIPTrustedProxy to RemoteIPInternalProxy. Thanks to Ken Dreyer for this fix.

Syntax updates for mod_r*.xml

typo fix

Further clarify the naming of the entity that directly connects to us by calling that entity a client instead of a peer.

Clarify the peer IP of the connection and the client IP of the request within the docs.

Update the documentation for the %a and %{c}a logging format strings, and update the mod-remoteip documentation in line with the new API.

Cleanup effort in prep for GA push: Trim trailing whitespace... no func change

Some typos.

Introduce new documentation of mod_remoteip