minor #14462 Correct English word order (dkarlovi)

This PR was submitted for the 5.x branch but it was merged into the 4.4 branch instead.

Discussion
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Correct English word order

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Commits
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17af86e Correct English word order

Author: javiereguiluz

mercure.rst

@@ -443,7 +443,7 @@ And here is the controller::
     To use the cookie authentication method, the Symfony app and the Hub
     must be served from the same domain (can be different sub-domains).
 
-Generating Programmatically The JWT Used to Publish
+Programmatically Generating The JWT Used to Publish
 ---------------------------------------------------
 
 Instead of directly storing a JWT in the configuration,