Improve tmRNA descriptions #269
Improve tmRNA descriptions #269

This should clean some of the strings that contain a silly description
for tmRNA's. Hopefully this deals with the issue overall.

RNAcentral/rnacentral-webcode,RNAcentral/rnacentral-webcode,RNAcentral/rnacentral-webcode,RNAcentral/rnacentral-webcode