Add missing return types (#382)

Co-authored-by: Maksim Sadym <[email protected]>

Author: sadym-chromium

index.bs

@@ -3146,6 +3146,8 @@ The [=remote end steps=] with |command parameters| are:
 
   1. [=Close=] |context|.
 
+  1. Return [=success=] with data null.
+
 Issue(w3c/webdriver-bidi#170): There is an open discussion about the behavior
 when closing the last [=top-level browsing context=]. We could expect to close
 the browser, close the session or leave this up to the implementation.
@@ -3601,6 +3603,12 @@ browsing context.
       }
       </pre>
    </dd>
+   <dt>Return Type</dt>
+   <dd>
+      <pre class="cddl">
+         EmptyResult
+      </pre>
+   </dd>
 </dl>
 
 <div algorithm="remote end steps for browsingContext.reload">
@@ -3630,6 +3638,8 @@ The [=remote end steps=] with |command parameters| are:
    condition|, history handling "<code>reload</code>", and ignore
    cache |ignore cache|.
 
+1. Return [=success=] with data null.
+
 </div>
 
 
@@ -4808,6 +4818,12 @@ other handles or strong ECMAScript references.
       }
       </pre>
    </dd>
+   <dt>Return Type</dt>
+   <dd>
+      <pre class="cddl">
+         EmptyResult
+      </pre>
+   </dd>
 </dl>
 
 <div algorithm="remote end steps for script.disown">
@@ -4824,6 +4840,8 @@ The [=remote end steps=] with |command parameters| are:
 
    1. If |handle map| contains |handle id|, remove |handle id| from the |handle map|.
 
+1. Return [=success=] with data null.
+
 </div>
 
 #### The script.callFunction Command ####  {#command-script-callFunction}