Fix common misspellings
I stumbled upon the typo in README.draft, so took the opportunity to
grep for common misspellings using List_of_common_misspellings.txt for
hunspell.
diff --git a/doc/draft-spittka-payload-rtp-opus.xml b/doc/draft-spittka-payload-rtp-opus.xml
index 09450d0..05dd3de 100644
--- a/doc/draft-spittka-payload-rtp-opus.xml
+++ b/doc/draft-spittka-payload-rtp-opus.xml
@@ -761,7 +761,7 @@
"maxcodedaudiobandwidth" as this would lead to inefficient use of network resources. The "maxcodedaudiobandwidth" parameter does not
affect interoperability. Also, this parameter SHOULD NOT be used
to adjust the audio bandwidth as a function of the bitrates, as this
- is the responsability of the Opus encoder implementation.
+ is the responsibility of the Opus encoder implementation.
</t>
<t>The parameter "maxaveragebitrate" is a unidirectional receive-only