Replace single quotes by double quotes as asked by @rkratky

Signed-off-by: Fabrice Flore-Thébault <[email protected]>

Author: themr0c

asciidoc-markup-sample-doc/asciidoc-markup-samples.adoc

@@ -17,11 +17,11 @@ Some markup examples used in this overview are based on new Asciidoctor features
 
 a|Anchor
 
-NOTE: The `+++{context}+++` variable is recommended for making modules reusable. Example: `+++[id='section-header_{context}']+++`. For details, see the link:https://redhat-documentation.github.io/modular-docs/#reusing-modules[Modular Documentation Reference Guide].
+NOTE: The `+++{context}+++` variable is recommended for making modules reusable. Example: `+++[id="section-header_{context}"]+++`. For details, see the link:https://redhat-documentation.github.io/modular-docs/#reusing-modules[Modular Documentation Reference Guide].
 
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-[id='section-header_{variable}']
+[id="section-header_{variable}"]
 Section Header
 ....
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