Miscellaneous spelling corrections.

fixes #4625
Merge pull request #314 from marklocker/3.2/develop

Miscellaneous spelling corrections. (refs #4625)
Change Curl class to use custom request for post requests only as put requests must be set with CURLOPT_INFILE and CURLOPT_INFILESIZE.

refs #4605
remove userguide pages that link to dead pages (refs #4640)