Add missing words to spelling list

7 jobs for fix_pycbc_references in 2 minutes and 4 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #392029
doctest

00:02:03

passed #392027
html

00:01:27

passed #392030
latexpdf

00:01:53

passed #392031
linkcheck

00:02:01

passed #392032
spelling

00:01:34

manual #392028
allowed to fail manual
stop review
passed #392026
validate-voevents

00:00:28