minor #21061 [Messenger] Fix dead link to Mathias Noback's blog (sebgarwood-gl)

This PR was submitted for the 7.3 branch but it was merged into the 6.4 branch instead.

Discussion
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[Messenger] Fix dead link to Mathias Noback's blog

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Commits
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22f737e Fix dead link to Mathias Noback blog

Author: javiereguiluz

components/messenger.rst

@@ -366,5 +366,5 @@ Learn more
     /messenger
     /messenger/*
 
-.. _`blog posts about command buses`: https://matthiasnoback.nl/tags/command%20bus/
+.. _`blog posts about command buses`: https://matthiasnoback.nl/tags/command-bus/
 .. _`SimpleBus project`: https://docs.simplebus.io/en/latest/