Link clarifying adding plugins (mmistakes#3181)

jasonhemann · web-flow · commit 6bd64ffd4784 · 2021-10-19T11:21:55.000-04:00
The phrase "put them here!" doesn't sufficiently clarify what to do; I add link to the Jekyll documentation with the proper syntax.
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
 ```

Original file line number	Diff line number	Diff line change
`@@ -84,6 +84,7 @@ gem "minimal-mistakes-jekyll"`
`84`	`84`	`# gem "jekyll-include-cache"`
`85`	`85`	`#`
`86`	`86`	`# If you have any other plugins, put them here!`
	`87`	`+# Cf. https://jekyllrb.com/docs/plugins/installation/`
`87`	`88`	`group :jekyll_plugins do`
`88`	`89`	`end`
`89`	`90`	```