Minor improvements to LogLocator docstring

Author: dstansby

lib/matplotlib/ticker.py

@@ -2259,19 +2259,19 @@ class LogLocator(Locator):
 
     def __init__(self, base=10.0, subs=(1.0,), numdecs=4, numticks=None):
         """
-        Place ticks on the locations : subs[j] * base**i
+        Place ticks at values ``subs[j] * base**n``.
 
         Parameters
         ----------
         base : float, default: 10.0
             The base of the log used, so major ticks are placed at
-            ``base**n``, n integer.
-        subs : None or str or sequence of float, default: (1.0,)
+            ``base**n``, where ``n`` is an integer.
+        subs : None or {'auto', 'all'} or sequence of float, default: (1.0,)
             Gives the multiples of integer powers of the base at which
-            to place ticks.  The default places ticks only at
+            to place ticks.  The default of ``(1.0, )`` places ticks only at
             integer powers of the base.
-            The permitted string values are ``'auto'`` and ``'all'``,
-            both of which use an algorithm based on the axis view
+            Permitted string values are ``'auto'`` and ``'all'``.
+            Both of these use an algorithm based on the axis view
             limits to determine whether and how to put ticks between
             integer powers of the base.  With ``'auto'``, ticks are
             placed only between integer powers; with ``'all'``, the