Update plot_outlier_detection.py

I think this word should be inliers.
Merge pull request #3889 from jdcaballero/master

Update plot_outlier_detection.py
DOC: COSMIT: Naive Bayes long url + PEP8 cleanup

* Put long link to IR-book on its own line to make sure it renders as a
  correct link in the docs.

* Put long ValueError messages that were breaking PEP8 compliance of
  the file `naive_bayes.py` into temporary variables.

Signed-off-by: mr.Shu <mr@shu.io>
Merge pull request #3892 from mrshu/mrshu/naive-bayes-small-fixes

DOC: COSMIT: Naive Bayes long url + PEP8 cleanup
DOC narrative docs for grid search's robustness to failure
ENH add coverage multilabel ranking metric
Remove copy paste mistake
DOC improve documentation of coverage
TST make separate tests for coverage + remove redundant tests with commons
DOC clarify how ties are broken for coverage_error
ENH add sample_weight support
DOC typo
TST + FIX ensure that it fails if sample_weight has not proper length
DOC more explicit title
Update what's new