Improve docstrings

Signed-off-by: JoeLametta <JoeLametta@users.noreply.github.com>

whipper/program/flac.py

@@ -6,8 +6,9 @@ logger = logging.getLogger(__name__)
 
 def encode(infile, outfile):
     """
-    Encodes infile to outfile, with flac.
-    Uses '-f' because whipper already creates the file.
+    Encode infile to outfile, with flac.
+
+    Uses ``-f`` because whipper already creates the file.
     """
     try:
         # TODO: Replace with Popen so that we can catch stderr and write it to