doc/protocols: Remove IPFS urls to specific content in examples

We shouldn't be providing links to unverified and non-FFmpeg-controlled
content in our documentation.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

doc/protocols.texi

@@ -635,12 +635,12 @@ and @code{$HOME/.ipfs/}, in that order.
 
 One can use this protocol in 2 ways. Using IPFS:
 @example
-ffplay ipfs://QmbGtJg23skhvFmu9mJiePVByhfzu5rwo74MEkVDYAmF5T
+ffplay ipfs://<hash>
 @end example
 
 Or the IPNS protocol (IPNS is mutable IPFS):
 @example
-ffplay ipns://QmbGtJg23skhvFmu9mJiePVByhfzu5rwo74MEkVDYAmF5T
+ffplay ipns://<hash>
 @end example
 
 @section mmst