DOC-1281 Puppet Server puppet_conf_setting_diffs edit

Edited puppet_conf_setting_diffs.markdown
DOC-1281: Edits to puppet_conf_setting_diffs.

Title change, fixed style on file names (`puppet.conf` -> puppet.conf), and fixed awkward usage error.
(SERVER-218) Docs on SSL server cert change and virtual ips

This commit includes some documentation related to the issue discovered
in SERVER-207 - the JDK assertion made that the server certificate does
not change following a session resumption attempt and a renegotiation
attempted from servers behind a virtual ip address.
(SERVER-218) Reworded run-on sentence

This commit rewords a run-on sentence that was in a previous commit of
the `virtual_ips.markdown` file.
(SERVER-218) Updated wording on SSL connection known issue title

This commit updates the wording on the title of the SSL connection known
issue to include "Load-Balanced" since this is likely the context that
users would apply to the issue being documented for this branch.
Merge pull request #309 from camlow325/maint/master/SERVER-218-document-ssl-reneg-virtual-ip-options

(SERVER-218) Docs on SSL server cert change and virtual ips
(MAINT) Updated changelog
Merge pull request #324 from dankreek/MAINT/update-changelog

(MAINT) Update changelog
Merge pull request #315 from jbondpdx/conf-setting-diff

DOC-1281 Puppet Server puppet_conf_setting_diffs edit