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
DOC: add PyPy support to FAQ

People ask me this all the time.
DOC 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 + use nose assert_ functions
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 (?).'
Merge branch 'simplify-fselection'

Fixes #3131.
MAINT make export_graphviz more exception-safe
Improved formatting of unsupported sparse matrices in swapping
Merge pull request #3140 from MechCoder/small_fixes

TST Improved handling of unsupported sparse matrices in swapping
Revert "COSMIT skip some repeated computations in k-means"

This reverts commit e3583daa2f196b5822f784c7e53f081668ecef6d,
except for a typo fix.

Fixes #3039.