Bug 1691938 [wpt PR 27564] - Update interfaces/cors-rfc1918.idl, a=testonly

Automatic update from web-platform-tests
Update interfaces/cors-rfc1918.idl (#27564)

Source: https://github.com/w3c/webref/blob/16294ab/ed/idl/cors-rfc1918.idl
Build: https://travis-ci.org/w3c/webref/builds/216653567
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wpt-commits: 3e9807e5c4dde99e83dedf76bcf705e4d9cd21ed
wpt-pr: 27564

testing/web-platform/tests/interfaces/cors-rfc1918.idl

@@ -1,7 +1,7 @@
 // GENERATED CONTENT - DO NOT EDIT
 // Content was automatically extracted by Reffy into webref
 // (https://github.com/w3c/webref)
-// Source: CORS and RFC1918 (https://wicg.github.io/cors-rfc1918/)
+// Source: CORS and RFC1918 (https://wicg.github.io/private-network-access/)
 
 enum AddressSpace { "local", "private", "public" };