Fixed a typo in the installation tutorial

Signed-off-by: Andrea Spadaccini <spadaccio@google.com>
Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

doc/install.rst

@@ -182,7 +182,7 @@ other. For example::
   (xend-relocation-hosts-allow '^192\\.0\\.2\\.[0-9]+$')
 
 
-The second line assumess that the hypervisor parameter
+The second line assumes that the hypervisor parameter
 ``migration_port`` is set 8002, otherwise modify it to match. The last
 line assumes that all your nodes have secondary IPs in the
 192.0.2.0/24 network, adjust it accordingly to your setup.