review comments and consistency

Author: lindseymoore

source/get-started.txt

@@ -20,7 +20,7 @@ Get Started with the PHP Library
 
 .. toctree::
 
-   Download and Install </get-started/download-and-install/>
+   Download & Install </get-started/download-and-install/>
    Create a Deployment </get-started/create-a-deployment/>
    Create a Connection String </get-started/create-a-connection-string/>
    Connect to MongoDB </get-started/connect-to-mongodb/>

source/index.txt

@@ -12,19 +12,19 @@ MongoDB PHP Library
 
    Get Started </get-started>
    Connect to MongoDB </connect>
-   Databases and Collections </databases-collections>
+   Databases & Collections </databases-collections>
    Read Data </read>
    Write Data </write>
    CRUD Operations & Replica Sets </read-write-pref>
    Run a Database Command </run-command>
    Data Aggregation </aggregation>
    Indexes </indexes>
    Monitor Your Application </monitoring>
-   Secure Your Data </security>
+   Security </security>
    Specialized Data Formats </data-formats>
    Compatibility </compatibility>
    What's New </whats-new>
-   Upgrade Library Versions </upgrade>
+   Upgrade </upgrade>
    FAQ </faq>
    API Documentation </reference>
 

source/indexes.txt

@@ -23,9 +23,9 @@ Optimize Queries by Using Indexes
    :maxdepth: 1
 
    Index Management </indexes/index-mgmt>
-   Single Field </indexes/single-field-index>
-   Compound </indexes/compound-index>
-   Multikey </indexes/multikey-index>
+   Single Field Indexes </indexes/single-field-index>
+   Compound Indexes </indexes/compound-index>
+   Multikey Indexes </indexes/multikey-index>
    Atlas Search </indexes/atlas-search-index>
 
 Overview