minor #6971 Update composer.rst (TravisCarden)

This PR was merged into the 2.7 branch.

Discussion
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Update composer.rst

Little typo.

Commits
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adb72ec Update composer.rst

Author: xabbuh

setup/composer.rst

@@ -10,7 +10,7 @@ Components in your PHP projects.
 
 Since this article was first published, Composer installation has improved a lot.
 Therefore, the original contents of this article have been removed and you are
-encourage to `install Composer`_ as explained in the official Composer documentation.
+encouraged to `install Composer`_ as explained in the official Composer documentation.
 
 .. _`Composer`: https://getcomposer.org/
 .. _`install Composer`: https://getcomposer.org/download/