message: docs: add missing period to the Security guide
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diff: @@ -87,7 +87,7 @@ The following template binds the value of `htmlSnippet`, once by interpolating i
  Interpolated content is always escaped &mdash;the HTML isn't interpreted and the browser displays angle brackets in the element's text content.
  For the HTML to be interpreted, bind it to an HTML property such as `innerHTML`.
  -But binding a value that an attacker might control into `innerHTML` normally causes an XSS vulnerability
  +But binding a value that an attacker might control into `innerHTML` normally causes an XSS vulnerability.
  For example, one could execute JavaScript in a following way:
  <code-example header="src/app/inner-html-binding.component.ts (class)" path="security/src/app/inner-html-binding.component.ts" region="class"></code-example>
  