[#3252] Fix typos in the ARM

Author: msiodelski

doc/sphinx/arm/ext-radius.rst

@@ -394,7 +394,7 @@ other than Discover and the first Request from each client.
     parameters are incompatible with the hub-and-spoke configuration of the
     :ischooklib:`libdhcp_ha.so`. This hook library uses an originally
     selected subnet for choosing an HA relationship to process a packet.
-    The subnet reslection may interefere with this choice. See the
+    The subnet reselection may interfere with this choice. See the
     :ref:`ha-hub-and-spoke` for details.
 
 .. _radius-server-example:

doc/sphinx/arm/hooks-ha.rst

@@ -2613,5 +2613,5 @@ branch ``server3``:
     The hub-and-spoke configuration is currently incompatible with the ``reselect-subnet-address``
     and ``reselect-subnet-pool`` parameters of the :ischooklib:`libdhcp_radius.so`. The High
     Availability hook library uses an originally selected subnet for choosing an HA relationship
-    to process a packet. The subnet reslection may interefere with this choice. See the
+    to process a packet. The subnet reselection may interfere with this choice. See the
     :ref:`radius-config` for details.