This reverts commit 2c89bf3b35ee290d7b830ef270df3a96aa48245e, reversing changes made to 9f7e413148ca5dbac9b555d7b0d0a5fa3a0f5340.
Since *u* is pronounced `/ju/` in this case, the *n* is not added to prevent a hiatus here. Cf. https://en.wiktionary.org/wiki/an#Usage_notes.
add links to supported XML formats