docs: update footer trademark link to LF Projects Series LLC

Fixes #671

Author: Atishyy27

docs/overrides/partials/copyright.html

@@ -1,9 +1,9 @@
 <div class="md-copyright">
     {% if config.copyright %}
     <div class="md-copyright__highlight">
-        {{ config.copyright }}.<br>The Linux Foundation has registered trademarks and uses
-        trademarks. For a list of trademarks of The Linux Foundation, please see our <a
-            href="https://www.linuxfoundation.org/trademark-usage" />Trademark Usage page</a>.
+        {{ config.copyright }}.<br>LF Projects, LLC has registered trademarks and uses
+        trademarks. For a list of trademarks of LF Projects, LLC, please see our <a
+            href="https://lfprojects.org/policies/" />Policies page</a>.
     </div>
     {% endif %}
     {% if not config.extra.generator == false %}