Fix grammar in id section (#1102)

index.html

@@ -890,7 +890,7 @@ <h3>
  </ol>
  <aside class="example" title="Resulting ids">
  <p>
- Below table shows some example `id`s resulting from the [=process
+ The table below shows some example `id`s resulting from the [=process
  the `id` member=] steps.
  </p>
  <table class="data">
@@ -1008,9 +1008,9 @@ <h3>
  <p>
  Since [=manifest/id=] is resolved against [=manifest/start_url=]'s
  [=URL/origin=], providing "../foo", "foo", "/foo", "./foo" all
- resolves to the same [=identifier=]. It is As such, best practice
+ resolves to the same [=identifier=]. As such, best practice
  is to use a leading "/" to be explicit that the id is a
- root-relative url path. Also, standard encoding/decoding rules are
+ root-relative URL path. Also, standard encoding/decoding rules
  apply to the id processing algorithm, as per the [[[URL]]].
  </p>
  </aside>