adding missing ticks around command
Update source/languages/en/riak/cookbooks/Linux-Performance-Tuning.md

* Added an h3 section called "Open Files Limit" right after the h2
  section "Linux Tuning", describing the need of increasing the
  open-files limit.
Fixed up 2 links to use the markup syntax.
Fixed up one link as suggested by @coderoshi
Merge pull request #213 from basho/kr-add-openlimit-to-linuxtuning

Update source/languages/en/riak/cookbooks/Linux-Performance-Tuning.md
Added instructions for installing 1.3.0 on closed networks.
Merge pull request #214 from angrycub/master

Updated 1.3.0rc2 links to 1.3.0 release links.
Merge pull request #212 from basho/missing-ticks

Found a riak-admin command without ticks, so I added them.
Add code section to install Riak 1.3.0 from source
Add Install from Source section for Riak 1.3.0 for Mac, RHEL, generic
Fix Repair index code snippets

Also, a little typo on Secondary-Indexes.
MD, bullet lists and code snippets secrets:
https://gist.github.com/clintel/1155906
(need to indent to 4 * level spaces)
Fix tiny typo on Benchmarking page
Merge pull request #221 from basho/eas-benchmarking-typo

Fix tiny typo on Benchmarking page
Merge pull request #217 from dmitrizagidulin/install_1.3.0_from_source

Install 1.3.0 from source
Merge pull request #219 from basho/eas-fix-2i-typos

Fix repair index page code snippets
Merge pull request #216 from hectcastro/installation-on-closed-networks

Added instructions for installing 1.3.0 on closed networks
HTTP interface ports used by dev instances weren't accurate.
Update advanced and default repl
typos
Merge pull request #223 from hectcastro/building-a-development-env

Building a Development Environment