docs: change `project` to `projected` for past tense (#42118)

PR Close #42118

aio/content/guide/content-projection.md

@@ -114,7 +114,7 @@ The following steps demonstrate a typical implementation of conditional content
 
    In the previous step, you added an `ng-template` element with a custom attribute, `appExampleZippyDirective`. This code provides the logic that Angular will use when it encounters that custom attribute. In this case, that logic instructs Angular to instantiate a template reference.
 
-1. In the component you want to project content into, use `@ContentChild` to get the template of the project content.
+1. In the component you want to project content into, use `@ContentChild` to get the template of the projected content.
 
    <code-example path="content-projection/src/app/app.component.ts" header="content-projection/src/app/app.component.ts" region="contentchild">
    </code-example>