Fix spelling and grammatical mistake

Author: vishal sodani

docs/intro/learning.rst

@@ -36,7 +36,7 @@ Hacking Secret Ciphers with Python
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 This book teaches Python programming and basic cryptography for absolute
-beginners. The chapters provide the source code for various ciphres, as well
+beginners. The chapters provide the source code for various ciphers, as well
 as programs that can break them.
 
     `Hacking Secret Ciphers with Python <http://inventwithpython.com/hacking/>`_
@@ -64,7 +64,7 @@ Dive Into Python 3
 
 Dive Into Python 3 is a good book for those ready to jump in to Python 3. It's
 a good read if you are moving from Python 2 to 3 or if you already have some
-experience programming in another language.
+experience in programming in another language.
 
     `Dive Into Python 3 <http://www.diveinto.org/python3/>`_