Improve usage share count (#138)

* Improve usage share

* Remove 'No caveats' note from all snippets

* Fix transform-centering usage: #search -> #feat

* transform -> transforms2d

* Add missing link for multiline truncate

snippets/custom-variables.md

@@ -39,8 +39,6 @@ Reuse variables throughout the document using the `var(--variable-name)` functio
 
 #### Browser support
 
-<span class="snippet__support-note">✅ No caveats.</span>
-
 - https://caniuse.com/#feat=css-variables
 
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