fix: Rename webrtc-w3c to webrtc-private-to-private

We have decided to rename `webrtc-w3c` to `webrtc-private-to-private`. See
rational in multiformats/multiaddr#150.

No software has been released using `webrtc-w3c`, thus renaming is not a
breaking change. Ignoring the automated `multiaddr` `v11.5.0` release.

See also multiformats#309 that introduced `webrtc-w3c`.

Author: mxinden

src/protocols-table.ts

@@ -21,7 +21,7 @@ export const table: Array<[number, number, string, boolean?, boolean?]> = [
   [276, 0, 'p2p-webrtc-direct'],
   [277, 0, 'p2p-stardust'],
   [280, 0, 'webrtc'],
-  [281, 0, 'webrtc-w3c'],
+  [281, 0, 'webrtc-private-to-private'],
   [290, 0, 'p2p-circuit'],
   [301, 0, 'udt'],
   [302, 0, 'utp'],