message: docs: fix link to "Override component providers"
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diff: @@ -920,7 +920,7 @@ so it is safe to call `TestBed.get()` as follows:
  <div class="alert is-helpful">
  For a use case in which `TestBed.get()` does not work,
  -see the section [_Override a component's providers_](#component-override), which
  +see the [_Override component providers_](#component-override) section that
  explains when and why you must get the service from the component's injector instead.
  </div>
  