Add dot parameter description to buck query docs.
Add dot parameter description to buck query docs.

Summary:

Add dot parameter description to buck query docs, and provide sample usage.
Fix related wording in the 'allpaths' operator.

Closes https://github.com/facebook/buck/pull/431

Test Plan:
Publish the docs locally and inspect the generated page.
  $ bash docs/soyweb-local.sh

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