DOC Adds an example to PatchExtractor (#12819)
DOC Adds an example to PatchExtractor (#12819)

* Finalizes fix for #12202 from abandonned PR by @parul-l

* Completes 12202 fix abandoned by @parul-l

* Completes 12202 fix abandoned by @parul-l

* Extends 12202 fix over feature_extraction/image.py

* Closes #12202; white space removal

* Closes #12202; white space removal2

* Closes #12202; 3.5 compliance; added >>> in docstring code.

* Closes #12202; indentation discrep.

* Closes #12202; indentation discrep.2

* Example output formating; @jnotham

* Example output formating; forgot flake8

* Closes #12202; Removed excessive indentation in docstring (#wimlds)

* Closes #12202; Fixed inconsistent indentation in docstring (#wimlds)

* Closes #12202 (#wimlds); intentation, v3.5 compliance

* Closes #12202 (#wimlds); Output format issue solved with addition of # doctest: +NORMALIZE_WHITESPACE +DONT_ACCEPT_BLANKLINE +ELLIPSIS for print statements.

* Closes #12202 (#wimlds); Output format issue solved with addition of # doctest: +NORMALIZE_WHITESPACE +DONT_ACCEPT_BLANKLINE for print statements.

* Closes #12202 (#wimlds); Testing doctest direc.: removed DONT_ACCEPT_BLANKLINE (@jnothmam, @reshamas)

* Closes #12202 (#wimlds); Removed blank lines in doctest example.

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