Fix misspellings

Found by running the python misspellings package

Change-Id: I6a1b4ee5dee54a4c5adc9780718b258ba20f4d53

doc/high-availability-guide/aa-haproxy.txt

@@ -4,7 +4,7 @@
 HAProxy is a very fast and reliable solution offering high availability, load balancing, and proxying
 for TCP and HTTP-based applications. It is particularly suited for web sites crawling under very high loads
 while needing persistence or Layer 7 processing. Supporting tens of thousands of connections is clearly
-realistic with todays hardware.
+realistic with today's hardware.
 
 For installing HAproxy on your nodes, you should consider its http://haproxy.1wt.eu/#docs[official documentation].
 Also, you have to consider that this service should not be a single point of failure, so you need at least two

doc/high-availability-guide/aa-network.txt

@@ -18,23 +18,22 @@ highly available.
 
 ==== Running Neutron DHCP Agent
 
-Since the Grizzly release, OpenStack Networking service has a scheduler which
+Since the Grizzly release, OpenStack Networking service has a scheduler that
-allows to run multiple agents accross nodes. Also, the DHCP agent can be natively
+lets you run multiple agents across nodes. Also, the DHCP agent can be natively
-highly available. Please follow the http://docs.openstack.org/trunk/config-reference/content/app_demo_multi_dhcp_agents.html[OpenStack Configuration Reference] for
+highly available. For details, see http://docs.openstack.org/trunk/config-reference/content/app_demo_multi_dhcp_agents.html[OpenStack Configuration Reference].
-further details.
 
 ==== Running Neutron L3 Agent
 
 Since the Grizzly release, the Neutron L3 Agent is scalable thanks to the scheduler
-which allows distribution of virtual routers across multiple nodes.
+that allows distribution of virtual routers across multiple nodes.
 But there is no native feature to make these routers highly available.
 At this time, the Active / Passive solution exists to run the Neutron L3
-agent in failover mode with Pacemaker. Please refer to the Active / Passive
+agent in failover mode with Pacemaker. See the Active / Passive
 section of this guide.
 
 ==== Running Neutron Metadata Agent
 
 There is no native feature to make this service highly available.
 At this time, the Active / Passive solution exists to run the Neutron
-Metadata agent in failover mode with Pacemaker. Please refer to the Active /
+Metadata agent in failover mode with Pacemaker. See the Active /
 Passive section of this guide.

doc/security-guide/ch024_authentication.xml

@@ -69,7 +69,7 @@
 
         <para>For client authentication with SSL, you need to issue
         certificates. These certificates can be signed by an external
-        authority or by the cloud adminstrator. OpenStack services by
+        authority or by the cloud administrator. OpenStack services by
         default check the signatures of certificates and connections
         fail if the signature cannot be checked. If the administrator
         uses self-signed certificates, the check might need to be

doc/training-guides/bk000-preface.xml

@@ -79,7 +79,7 @@
                 </para>
               </formalpara>
             <note>
-              <para>Here are more details on commiting changes to OpenStack <link
+              <para>Here are more details on committing changes to OpenStack <link
                     xlink:href="operator-getting-started-lab.html#submit-doc-bug">fixing a documentation bug</link>
                     , <link xlink:href="https://wiki.openstack.org/wiki/Gerrit_Workflow">OpenStack Gerrit
                     Workflow</link>, <link xlink:href="https://wiki.openstack.org/wiki/Documentation/HowTo">OpenStack
@@ -149,4 +149,4 @@
         </section>
     </appendix>
     <xi:include href="../common/app_support.xml"/>
-</book>
+</book>

doc/training-guides/operator-editing-code.xml

@@ -440,7 +440,7 @@ blueprint training-manuals</programlisting></para>
                 </step>
                 <step>
                     <para>Copy in other content sources like the Aptira content, your own text
-                        describing what needs to be learned with the section, diagrams, and quizes.
+                        describing what needs to be learned with the section, diagrams, and quizzes.
                         If you include content from another source like Aptira cocntent make extra
                         paragraph referencing the file and/or HTTP address the content came
                         from.</para>