Update tools.rst

Fixed a typo.
bugfix: don't mess up the order of arguments when displaying in pathExpression
account for duplicate pathExpressions; add a few more cases
Merge pull request #273 from vimeo/make-output-target-name-match-url-param

Make output target name match url param
Fix typo in formatPathExpression.

Commit 2d710e0c introduced this simple typo that results in:
  NameError: global name 'i' is not defined
Merge pull request #276 from jeblair/master

Fix "global name 'i' is not defined" exception caused by typo.
Merge pull request #160 from lensen/patch-1

Typo in tools.rst
fix readthedocs functions.py doc generation
Merge pull request #293 from bitprophet/0.9.x

Fix leading dots in metrics/index.json
Conflicts:
	webapp/graphite/metrics/views.py