Add "If-None-Match" header to PUT requests in swift

Closes-Bug: #1301677

Change-Id: Ide993b736c116258e8d41b12d8c531feb05af552
author: diane fleming
Fix typos, capitalization and remove duplicated words

Checking done with topy.

Change-Id: I9c6897e8f3fff42fdcbc4df40605592bcbd9f362
Merge "Add "If-None-Match" header to PUT requests in swift"
Update terminology used in shelve extension

Use terminology used in Summer Long's User Guide updates

Change-Id: I2ef9b9e0f61c83a28b4ff6de0cc76e108c712508
author: diane fleming