Fix comments

camelot/parsers/stream.py

@@ -247,10 +247,10 @@ class Stream(BaseParser):
                                  " should be equal")
 
     def _nurminen_table_detection(self, textlines):
-        # an general heuristic implementation of the table detection
+        # a general heuristic implementation of the table detection
         # algorithm described by Anssi Nurminen's master's thesis:
         # https://dspace.cc.tut.fi/dpub/bitstream/handle/123456789/21520/Nurminen.pdf?sequence=3
-        # assumes that tables vertically separated by some distance
+        # assumes that tables are situated relatively apart vertically
 
         # TODO: add support for arabic text #141
         # sort textlines in reading order
@@ -263,9 +263,9 @@ class Stream(BaseParser):
         textedges.generate(text_grouped)
         # select relevant edges
         relevant_textedges = textedges.get_relevant()
-        # guess table areas using relevant edges
+        # guess table areas using textlines and relevant edges
         table_bbox = textedges.get_table_areas(textlines, relevant_textedges)
-        # treat whole page as table if not table areas found
+        # treat whole page as table area if no table areas found
         if not len(table_bbox):
             table_bbox = {(0, 0, self.pdf_width, self.pdf_height): None}