Link clarifying adding plugins (mmistakes#3181)

The phrase "put them here!" doesn't sufficiently clarify what to do; I add link to the Jekyll documentation with the proper syntax.
kaitokikuchi · Oct 19, 2021 · a1505ad · a1505ad
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commit a1505ad
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diff --git a/docs/_docs/03-installation.md b/docs/_docs/03-installation.md
@@ -84,6 +84,7 @@ gem "minimal-mistakes-jekyll"
 #   gem "jekyll-include-cache"
 #
 # If you have any other plugins, put them here!
+# Cf. https://jekyllrb.com/docs/plugins/installation/
 group :jekyll_plugins do
 end
 ```