minor symfony#8744 Corrected a spelling error. (ricknox)

This PR was submitted for the master branch but it was merged into the 3.3 branch instead (closes symfony#8744).

Discussion
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Corrected a spelling error.

Corrected a small misspelling.

Commits
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30545c4 Corrected a spelling error.

Author: weaverryan

workflow/state-machines.rst

@@ -14,7 +14,7 @@ machine.
 Example of a State Machine
 --------------------------
 
-A pull request starts in an intial "start" state, a state for e.g. running
+A pull request starts in an initial "start" state, a state for e.g. running
 tests on Travis. When this is finished, the pull request is in the "review"
 state, where contributors can require changes, reject or accept the
 pull request. At any time, you can also "update" the pull request, which