Update pmcs.md to allow links to sponsors.html
Allow Thanks to link to other
`www.apache.org/foundation/thanks.html` or
`www.apache.org/foundation/sponsors.html`
The thanks.html is actually a redirect to sponsors.html.
diff --git a/content/foundation/marks/pmcs.md b/content/foundation/marks/pmcs.md
index 935eb87..490f451 100644
--- a/content/foundation/marks/pmcs.md
+++ b/content/foundation/marks/pmcs.md
@@ -162,7 +162,8 @@
`www.apache.org/foundation/sponsorship.html`
- "Sponsors", "Thanks" or "Thanks to our Sponsors" should link to:
-`www.apache.org/foundation/thanks.html`
+`www.apache.org/foundation/thanks.html` or
+`www.apache.org/foundation/sponsors.html`
- "Security" should link to either to a project-specific page detailing how
users may securely report potential vulnerabilities, or to the main
