docs: ACTION_PACKAGE_REMOVED installed -> removed; EOL fixes

bugs: 26695226, 26695390

b/26695226: Fix the typo

b/26695390: Work-around the failing heuristic described in b/26695390 by adding
periods to terminate lines when we want the Javadoc parser to
stop parsing the sentence.

Change-Id: Ibf972d50157b693b695f0dd3bda9c7b5976a93de