Update doc based on review

Signed-off-by: joshuabezaleel <joshua.bezaleel@gmail.com>

docs/content/bundle/manifest/_index.md

@@ -512,7 +512,7 @@ You can access custom data at runtime using the `bundle.custom.KEY.SUBKEY` templ
 For example, `{{ bundle.custom.more-custom-config.enabled}}` allows you to
 access nested values from the custom section.
 
-Multiple custom values that were defined at the manifest can also be injected with new values during build time using the \--custom values tied to the `porter build` command. Currently only support string value. You can use dot notation to specify a nested field:
+Multiple custom values that were defined in the manifest can also be injected with new values during build time using the \--custom values tied to the `porter build` command. Currently only supports string values. You can use dot notation to specify a nested field:
 
 ```
 porter build --custom custom-config=new-custom-value --custom some-custom-config.item=edited-value