Merge branch 'defect/missing-fa-share-icon' into 'master'

Add missing fa-share icon

See merge request gitlab-org/gitlab!38235

app/assets/stylesheets/fontawesome_custom.scss

@@ -336,6 +336,10 @@
   content: '\f010';
 }
 
+.fa-share::before {
+  content: '\f064';
+}
+
 .fa-book::before {
   content: '\f02d';
 }