Show python code in the README properly (#100)

* Fix a typo

* Remove a colon to show inline code properly

Author: mineo

README.rst

@@ -36,7 +36,7 @@ Programmatic usage
 ------------------
 
 In order to use setuptools_scm for sphinx config, assuming the sphinx conf
-is one directory deeper than the project's root, use::
+is one directory deeper than the project's root, use:
 
 .. code:: python
 
@@ -48,7 +48,7 @@ Notable Plugins
 ----------------
 
 `setuptools_scm_git_archive <https://pypi.python.org/pypi/setuptools_scm_git_archive>`_
-provides partial support for obtaining versions from git archvies
+provides partial support for obtaining versions from git archives
 that belong to tagged versions. The only reason for not including
 it in setuptools-scm itself is git/github not supporting
 sufficient metadata for untagged/followup commits,