Fix a couple of typos and a few code snippet errors in the Python documentation

Author: willy-b

Doc/howto/logging-cookbook.rst

@@ -3920,7 +3920,7 @@ subclassed handler which looks something like this::
 
 You'll need to be familiar with RFC 5424 to fully understand the above code, and it
 may be that you have slightly different needs (e.g. for how you pass structural data
-to the log). Nevertheless, the above should be adaptable to your speciric needs. With
+to the log). Nevertheless, the above should be adaptable to your specific needs. With
 the above handler, you'd pass structured data using something like this::
 
     sd = {

Doc/howto/mro.rst

@@ -189,7 +189,7 @@ prescription:
   the tail of any of the other lists, then add it to the linearization
   of C and remove it from the lists in the merge, otherwise look at the
   head of the next list and take it, if it is a good head.  Then repeat
-  the operation until all the class are removed or it is impossible to
+  the operation until all the classes are removed or it is impossible to
   find good heads.  In this case, it is impossible to construct the
   merge, Python 2.3 will refuse to create the class C and will raise an
   exception.*

Doc/library/logging.config.rst

@@ -555,7 +555,7 @@ following configuration::
       'bar' : 'baz',
       'spam' : 99.9,
       'answer' : 42,
-      '.' {
+      '.' : {
         'foo': 'bar',
         'baz': 'bozz'
       }

Doc/library/pdb.rst

@@ -834,7 +834,7 @@ can be overridden by the local file.
         def inner(x):
             1 / x
 
-         out()
+        out()
 
    calling ``pdb.pm()`` will allow to move between exceptions::