minor #10620 Fixed a syntax issue (javiereguiluz)

This PR was squashed before being merged into the 3.4 branch (closes #10620).

Discussion
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Fixed a syntax issue

Reported by our friend @ro0NL via Symfony Slack.

Commits
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a717bef Fixed a syntax issue

Author: javiereguiluz

service_container/tags.rst

@@ -64,7 +64,7 @@ tag: the container sees that your class extends ``AbstractExtension`` (or more a
 that it implements ``ExtensionInterface``) and adds the tag for you.
 
 If you want to apply tags automatically for your own services, use the
-``_instanceof`` option::
+``_instanceof`` option:
 
 .. configuration-block::
 

weblink.rst

@@ -99,9 +99,8 @@ issuing an early separate HTTP request, use the ``nopush`` option:
 Resource Hints
 --------------
 
-`Resource Hints <https://www.w3.org/TR/resource-hints/#resource-hints>`_ are
-used by applications to help browsers when deciding which resources should be
-downloaded, preprocessed or connected to first.
+Resource Hints are used by applications to help browsers when deciding which
+resources should be downloaded, preprocessed or connected to first.
 
 The WebLink component provides the following Twig functions to send those hints: