Apply Chris Barker's latest PEP 485 changes

pep-0485.txt

@@ -16,7 +16,7 @@ Abstract
 
 This PEP proposes the addition of a function to the standard library
 that determines whether one value is approximately equal or "close"
-to another value. 
+to another value.
 
 
 Rationale
@@ -82,7 +82,7 @@ comparisons near zero.
 
 Modulo error checking, etc, the function will return the result of::
 
-    abs(expected-actual) <= max(tol*actual, abs_tol)
+    abs(expected-actual) <= max(tol*expected, abs_tol)
 
 
 Handling of non-finite numbers
@@ -103,7 +103,7 @@ theory, it should work for any type that supports ``abs()``,
 comparisons, and subtraction.  The code will be written and tested to
 accommodate these types:
 
-* ``Decimal``
+* ``Decimal``: for Decimal, the tolerance must be set to a Decimal type.
 
 * ``int``
 
@@ -123,12 +123,16 @@ optional parameter, ``abs_tol`` (default 0.0) can be used to set a
 minimum tolerance to be used in the case of very small relative
 tolerance. That is, the values will be considered close if::
 
-    abs(a-b) <= abs(tol*actual) or abs(a-b) <= abs_tol
+    abs(a-b) <= abs(tol*expected) or abs(a-b) <= abs_tol
 
 If the user sets the rel_tol parameter to 0.0, then only the absolute
 tolerance will effect the result, so this function provides an
 absolute tolerance check as well.
 
+A sample implementation is available (as of Jan 22, 2015) on gitHub:
+
+https://github.com/PythonCHB/close_pep/blob/master/is_close_to.py
+
 
 Relative Difference
 ===================