improve documentation text

Author: silviuaavram

docs/data/material/components/autocomplete/autocomplete.md

@@ -265,7 +265,9 @@ In the event that you need to lock certain tags so that they can't be removed, y
 
 {{"demo": "FixedTags.js"}}
 
-### Checkboxes
+### Selection indicators
+
+This example demonstrates how icons are used to indicate the selection state of each item in the listbox.
 
 {{"demo": "CheckboxesTags.js"}}
 

docs/data/material/components/selects/selects.md

@@ -97,7 +97,9 @@ Like with the single selection, you can pull out the new value by accessing `eve
 
 {{"demo": "MultipleSelect.js"}}
 
-### Checkmarks
+### Selection indicators
+
+This example demonstrates how icons are used to indicate the selection state of each item in the listbox.
 
 {{"demo": "MultipleSelectCheckmarks.js"}}