docs(forms): Fix typos in template-driven forms tutorial (angular#37933)

Fix two typos in the 'Building a template-driven form` that caused the guide to not be displayed correctly.

PR Close angular#37933

Author: bampakoa

aio/content/guide/forms.md

@@ -93,7 +93,7 @@ In the course of this tutorial, you bind a sample form to data and handle user i
    * Add custom CSS to provide visual feedback on the status.
    * Show and hide validation-error messages.
 4. Respond to a native HTML button-click event by adding to the model data.
-5. Handle form submission using the [`ngSubmit`(api/forms/NgForm#properties)] output property of the form.
+5. Handle form submission using the [`ngSubmit`](api/forms/NgForm#properties) output property of the form.
    * Disable the **Submit** button until the form is valid.
    * After submit, swap out the finished form for different content on the page.
 
@@ -467,7 +467,7 @@ You will bind the form property that indicates its overall validity to the **Sub
 3. Run the application now. Notice that the button is enabled—although
 it doesn't do anything useful yet.
 
-4. Delete the **Name** value. This violates the "required" rule, so it displays the error message&emdash;and notice that it also disables the **Submit** button.
+4. Delete the **Name** value. This violates the "required" rule, so it displays the error message—and notice that it also disables the **Submit** button.
 
 
    You didn't have to explicitly wire the button's enabled state to the form's validity.