message: docs: remove the extra backtick character
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diff: @@ -389,7 +389,7 @@ In the following example, the `HeroesService` makes an HTTP POST request when ad
  The `HttpClient.post()` method is similar to `get()` in that it has a type parameter, which you can use to specify that you expect the server to return data of a given type. The method takes a resource URL and two additional parameters:
  * *body* - The data to POST in the body of the request.
  -* *options*` - An object containing method options which, in this case, [specify required headers](#adding-headers).
  +* *options* - An object containing method options which, in this case, [specify required headers](#adding-headers).
  The example catches errors as [described above](#error-details).
  