fix: typo in pfe-icon README (#840)

Author: castastrophe

elements/pfe-icon/README.md

@@ -3,15 +3,15 @@
 ## Usage
 
 ```html
-<pfe-icon icon="rh-leaf"></pfe-card>
+<pfe-icon icon="rh-leaf"></pfe-icon>
 ```
 
 ## Slots
 
 There are no slots, but if you wish to display some text when JS is disabled, you can put some text inside the pfe-icon tag.  For instance, when using a checkmark icon in a server status table, you may wish to display "success" if JS is disabled.
 
 ```html
-<pfe-icon icon="rh-check-mark">success</pfe-card>
+<pfe-icon icon="rh-check-mark">success</pfe-icon>
 ```