make lineinfile docs clearer and make module pep8 (#23857)

lib/ansible/modules/files/lineinfile.py

@@ -55,7 +55,7 @@ options:
     description:
       - The regular expression to look for in every line of the file. For
         C(state=present), the pattern to replace if found; only the last line
-        found will be replaced. For C(state=absent), the pattern of the line
+        found will be replaced. For C(state=absent), the pattern of the line(s)
         to remove.  Uses Python regular expressions; see
         U(http://docs.python.org/2/library/re.html).
   state:
@@ -379,6 +379,7 @@ def absent(module, dest, regexp, line, backup):
     found = []
 
     b_line = to_bytes(line, errors='surrogate_or_strict')
+
     def matcher(b_cur_line):
         if regexp is not None:
             match_found = bre_c.search(b_cur_line)

test/sanity/pep8/legacy-files.txt

@@ -418,7 +418,6 @@ lib/ansible/modules/files/copy.py
 lib/ansible/modules/files/find.py
 lib/ansible/modules/files/ini_file.py
 lib/ansible/modules/files/iso_extract.py
-lib/ansible/modules/files/lineinfile.py
 lib/ansible/modules/files/patch.py
 lib/ansible/modules/files/replace.py
 lib/ansible/modules/files/stat.py