minor #15259 Fix typo (fbnlsr)

This PR was submitted for the 5.2 branch but it was merged into the 4.4 branch instead.

Discussion
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Fix typo

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Commits
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e17d15d Fix typo

Author: javiereguiluz

frontend/encore/dev-server.rst

@@ -8,14 +8,14 @@ While developing, instead of using ``yarn encore dev --watch``, you can use the
 
     $ yarn encore dev-server
 
-This builds and serves the front-end assets from a new server. This server runs at 
-``localhost:8080`` by default, meaning your build assets are available at ``localhost:8080/build``. 
-This server does not actually write the files to disk; instead it servers them from memory, 
+This builds and serves the front-end assets from a new server. This server runs at
+``localhost:8080`` by default, meaning your build assets are available at ``localhost:8080/build``.
+This server does not actually write the files to disk; instead it serves them from memory,
 allowing for hot module reloading.
 
-As a consequence, the ``link`` and ``script`` tags need to point to the new server. If you're using the 
-``encore_entry_script_tags()`` and ``encore_entry_link_tags()`` Twig shortcuts (or are 
-:ref:`processing your assets through entrypoints.json <load-manifest-files>` in some other way), 
+As a consequence, the ``link`` and ``script`` tags need to point to the new server. If you're using the
+``encore_entry_script_tags()`` and ``encore_entry_link_tags()`` Twig shortcuts (or are
+:ref:`processing your assets through entrypoints.json <load-manifest-files>` in some other way),
 you're done: the paths in your templates will automatically point to the dev server.
 
 The ``dev-server`` command supports all the options defined by `webpack-dev-server`_.