Update extension-manifest.md

Author: nielslyngsoe

16/umbraco-cms/customizing/extending-overview/extension-registry/extension-manifest.md

@@ -36,9 +36,9 @@ These fields are all required and have the following meaning:
 Most extension types support the use of the following generic features for their Manifest:
 
 * `weight` - Define a weight to determine the importance or visual order of this extension. A higher weight gives a more prominent position. For instance, for a dashboard it determines its order between other dashboards.
-* `overwrites` - If replacing an existing extension, this define one or more Extension Aliases that this extension should replace. Read more in [Replace, Exclude or Unregister extensions](replace-exclude-or-unregister.md).
+* `overwrites` - If you want to omit an existing extension, then define one or more Extension Aliases that this extension should omit when presented. Read more in [Replace, Exclude or Unregister extensions](replace-exclude-or-unregister.md).
 * `conditions` - Define one or more conditions that must pass for the extension to become available. For instance, don't show a section if you don't have the proper rights. Read more in [Extension Conditions](../extension-conditions.md). 
 * `kind` - Some extension types can reference a predefined `kind`. By specifying a `kind`, the manifest inherits the `kind`'s properties. This allows for reuse of predefined settings. See [Extension Kind](../extension-kind.md).
-* `meta` - Many Extension Types require additional information declared as part of a `meta` field. It depends on the extension what is required. For instance label and icon of a menu item.
+* `meta` - Many Extension Types require additional information declared as part of a `meta` field. It depends on the Extension Type what is required. For instance label and icon of a menu item.
 
-For more information, see an overview of all possible [Extension Types](../extension-types/) and their requirements.
+For more information, see an overview of all possible [Extension Types](../extension-types/) and their requirements.