Fix comments in doctest style docstring

Author: peterjc

Bio/SearchIO/BlastIO/__init__.py

@@ -177,14 +177,14 @@
 flag). Commented BLAST tabular files may be parsed, indexed, or written using
 the keyword argument 'comments' set to True:
 
-    # blast-tab defaults to parsing uncommented files
+    >>> # blast-tab defaults to parsing uncommented files
     >>> from Bio import SearchIO
     >>> uncommented = 'Blast/tab_2226_tblastn_004.txt'
     >>> qresult = SearchIO.read(uncommented, 'blast-tab')
     >>> qresult
     QueryResult(id='gi|11464971:4-101', 5 hits)
 
-    # set the keyword argument to parse commented files
+    >>> # set the keyword argument to parse commented files
     >>> commented = 'Blast/tab_2226_tblastn_008.txt'
     >>> qresult = SearchIO.read(commented, 'blast-tab', comments=True)
     >>> qresult
@@ -200,14 +200,14 @@
 query sequence ID. These names may be passed either as a Python list or as a
 space-separated strings.
 
-    # pass the custom column names as a Python list
+    >>> # pass the custom column names as a Python list
     >>> fname = 'Blast/tab_2226_tblastn_009.txt'
     >>> custom_fields = ['qseqid', 'sseqid']
     >>> qresult = next(SearchIO.parse(fname, 'blast-tab', fields=custom_fields))
     >>> qresult
     QueryResult(id='gi|16080617|ref|NP_391444.1|', 3 hits)
 
-    # pass the custom column names as a space-separated string
+    >>> # pass the custom column names as a space-separated string
     >>> fname = 'Blast/tab_2226_tblastn_009.txt'
     >>> custom_fields = 'qseqid sseqid'
     >>> qresult = next(SearchIO.parse(fname, 'blast-tab', fields=custom_fields))