Doc update

README.rst

@@ -87,7 +87,7 @@ file ~/.ipython/ipy_user_conf.py to add the following lines::
     # These two are the important ones.
     import memory_profiler
     ip.expose_magic('mprun', memory_profiler.magic_mprun)
-    ip.expose_magic('memit', memory_profiler.magic_memit)prun)
+    ip.expose_magic('memit', memory_profiler.magic_memit)
 
 For IPython 0.11+, you have to edit the file
 ~/.ipython/extensions/memory_profiler_ext.py with the following content::

memory_profiler.py

@@ -57,8 +57,7 @@ def memory_usage(proc=-1, num=-1, interval=.1):
     interval : int, optional
 
     num : int, optional
-        Number of samples to generate. In the case of
-        defaults to -1, meaning
+        Maximum number of retrievals. In the case of -1, meaning
         to wait until the process has finished if proc is a string or
         to get just one if proc is an integer.
 
@@ -67,7 +66,7 @@ def memory_usage(proc=-1, num=-1, interval=.1):
 
     Returns
     -------
-    mm : list of integers
+    mm : list of integers, size less than num
         memory usage, in KB
     """
     ret = []