Add new docs pages for pillar and ipcidr matchers
Add new pages to targeting toctree
Add external ref target for batching page
Add new targeting pages to docs index

Also, change the index pages to use external refs instead of the :doc:
role.
Add external ref target for pillar targeting
Remove pillar targeting page

There is already a section for this in the Pillar page, no need for a
dedicated page.
Remove pillar page from targeting toctree
Fix test.ping docstring

Lines need to be separated with a blank line to force a line break in
RST.
Merge pull request #13522 from terminalmage/docs

Add new page for ipcidr matcher