minor #6133 fixed the component name (fabpot)

This PR was merged into the 2.7 branch.

Discussion
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fixed the component name

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all

This fixes the component name which is "ExpressionLanguage" without a space (this is by the way consistent with the other components).

Commits
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d930d1d fixed the component name

Author: weaverryan

components/expression_language/index.rst

@@ -1,5 +1,5 @@
-Expression Language
-===================
+ExpressionLanguage
+==================
 
 .. toctree::
     :maxdepth: 2