Fixed typo: seperation to separation

Author: Joel Clermont

basic/index.html

@@ -519,7 +519,7 @@ <h2>
     Git is this flexibility in carefully crafting commits locally and then
     sharing them later, it is very powerful to be able to write three or
     four commits of logically separate changes so that your work may be more
-    easily peer reviewed.  Since there is a seperation between committing and
+    easily peer reviewed.  Since there is a separation between committing and
     pushing those changes, do take the time to make it easier for the people
     you are working with to see what you've done by putting each logically 
     separate change in a separate commit with a nice commit message so it