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.
Merge branch 'so-3.1' of https://github.com/ngaskill/liferay-docs into LRDOCS-1339
LRMATERIAL-1339 Wordsmithing
LRDOCS-1339 Wordsmithing
Merge pull request #1011 from jrao/LRDOCS-1339

LRDOCS-1339