Update working_with_text_data.rst

A few typos have been corrected.
Merge pull request #3135 from ugurthemaster/patch-1

Update working_with_text_data.rst
Add FAQ to docs.
removed sklearn, removed statsmodel, capitalization in SciPy
Add GPU support (there is none and will probably be none) to faq.
DOC faq formulation
typo
MAINT remove redundant class hierarchy + fix api perform parameter check in fit
DOC fix example in univariate selection (fix issue #3132)
FIX testing datasets have too few feature for default of SelectKBest
TST improve parameter checking
TST use standard assert_ function
DOC remove comment thanks to @jnothman ('All our feature selectors output masks now (as they should, IMO). It will be turned back into indices only for sparse matrix indexing, but only until we require scipy >= 0.14 (?).')
FIX TypeError: unorderable types: int() <= str()
COSMIT