Update 07-tools.md (#4689)

Tweak grammar.  "Most of the time" reads better than "most of the times".

docs/07-tools.md

@@ -72,7 +72,7 @@ Some libraries expose ES modules that you can import as-is — `the-answer` is o
 
 The [@rollup/plugin-commonjs](https://github.com/rollup/plugins/tree/master/packages/commonjs) plugin does exactly that.
 
-Note that most of the times `@rollup/plugin-commonjs` should go _before_ other plugins that transform your modules — this is to prevent other plugins from making changes that break the CommonJS detection. An exception for this rule is the Babel plugin, if you're using it then place it before the commonjs one.
+Note that most of the time `@rollup/plugin-commonjs` should go _before_ other plugins that transform your modules — this is to prevent other plugins from making changes that break the CommonJS detection. An exception for this rule is the Babel plugin, if you're using it then place it before the commonjs one.
 
 ### Peer dependencies