Update docs/classic-ui/icons.md

Co-authored-by: Steve Piercy <[email protected]>

Author: MrTango

docs/classic-ui/icons.md

@@ -46,7 +46,7 @@ Plone ships with the following icon registrations by default.
 - [Plone](https://github.com/plone/plone.staticresources/blob/master/src/plone/staticresources/profiles/default/registry/icons_plone.xml)
 - [Toolbar](https://github.com/plone/plone.staticresources/blob/master/src/plone/staticresources/profiles/default/registry/icons_plone.xml)
 
-The icons above are made available as plone resources.
+The icons above are made available as Plone resources.
 For example, the lightning icon's resource path is `++plone++bootstrap-icons/lightning.svg`. One could register another icon set under a new name, for example `++plone++fontawesome-icons` and override the registrations above to use them.