proc: update docstrings

eventlet/proc.py

@@ -630,6 +630,8 @@ class wrap_errors(object):
     wrap_errors provides a shortcut to write that in one line:
 
     func1 = wrap_errors((A, B, C), func)
+
+    It also preserves __str__ and __repr__ of the original function.
     """
 
     def __init__(self, errors, func):
@@ -657,7 +659,8 @@ class wrap_errors(object):
 
 
 class RunningProcSet(object):
-    """Maintain a set of Procs that are still running. Provide a way to wait/kill all of them."""
+    """Maintain a set of Procs that are still running, that is, automatically remove
+    a proc when it's finished. Provide a way to wait/kill all of them"""
 
     def __init__(self):
         self.procs = set()