fix scan_blast_executables() doc
fix scan_blast_executables() doc

Just update the docs to reflect the changes made in ~2.

aldermossy/sequenceserver,jasminZ/sequenceserver,yeban/sequenceserver,aldermossy/sequenceserver,elsiklab/sequenceserver,elsiklab/sequenceserver,deepakunni3/sequenceserver,deepakunni3/sequenceserver,lepbase/lepbase-sequenceserver,aldermossy/sequenceserver,vivekiitkgp/sequenceserver,vivekiitkgp/sequenceserver,yeban/sequenceserver,IsmailM/sequenceserver,yeban/sequenceserver,jasminZ/sequenceserver,aldermossy/sequenceserver,vivekiitkgp/sequenceserver,yeban/sequenceserver,jasminZ/sequenceserver,lepbase/lepbase-sequenceserver,IsmailM/sequenceserver,IsmailM/sequenceserver,lepbase/lepbase-sequenceserver,elsiklab/sequenceserver,deepakunni3/sequenceserver