Updates to Social Office user guide for SO 3.1.
Text edits for SO 3.1 update.
Adding new images for SO 3.1 update.
Edits and new screenshot for SO 3.1 update.
Edits and updated screenshot for SO 3.1 update.
Added statements specifying 3.1 only features.
LRDOCS-1286 Markdown converter supports sidebars
Merge branch 'so-3.1' of https://github.com/ngaskill/liferay-docs into LRDOCS-1339
LRMATERIAL-1339 Wordsmithing
LRDOCS-1339 Wordsmithing
Merge pull request #1010 from jhinkey/markdown-converter-with-sidebar-support

LRDOCS-1286 Markdown converter supports sidebars
Merge pull request #1011 from jrao/LRDOCS-1339

LRDOCS-1339