Fix broken 'Back to index' link in left nav, table of contents.

Rename 'Back' link to 'Back to Samples'.

spring-geode-docs/src/docs/asciidoc/guides/boot-actuator.adoc

@@ -24,7 +24,10 @@ for your application.  In the future, SBDG will provide dedicated support for ht
 
 This guide assumes you are already familiar with Spring Boot and Apache Geode (or Pivotal GemFire).
 
-link:../index.html#geode-samples[Back]
+[#index-link]
+link:../index.html[Index]
+
+link:../index.html#geode-samples[Back to Samples]
 
 [[geode-samples-boot-actuator-example]]
 == Example Application
@@ -360,4 +363,4 @@ You are encouraged to read more about {spring-boot-docs}/production-ready.html[S
 Additonally, you can find out more about Apache Geode Statistics
 in the {apache-geode-docs}/managing/statistics/chapter_overview.html[User Guide].
 
-link:../index.html#geode-samples[Back]
+link:../index.html#geode-samples[Back to Samples]

spring-geode-docs/src/docs/asciidoc/guides/boot-configuration.adoc

@@ -26,7 +26,10 @@ presentation by John Blum during the 2017 SpringOne Platform conference.  While
 presented in the talk both use Spring Boot, only this example is using Spring Boot for Apache Geode (SBDG). This guide
 improves on the example from the presentation by using SBDG.
 
-link:../index.html#geode-samples[Back]
+[#index-link]
+link:../index.html[Index]
+
+link:../index.html#geode-samples[Back to Samples]
 
 [[geode-samples-boot-configuration-app-domain-classes]]
 == Application Domain Classes
@@ -1140,4 +1143,4 @@ and Spring Session.  However, the concepts and effects are similar to what has b
 We leave it as an exercise for you to explore and understand the remaining _auto-configuration_ bits using this guide
 as a reference for your learning purposes.
 
-link:../index.html#geode-samples[Back]
+link:../index.html#geode-samples[Back to Samples]

spring-geode-docs/src/docs/asciidoc/guides/caching-http-session.adoc

@@ -30,7 +30,10 @@ Spring Boot applications.
 
 Let's begin.
 
-link:../index.html#geode-samples[Back]
+[#index-link]
+link:../index.html[Index]
+
+link:../index.html#geode-samples[Back to Samples]
 
 [[geode-samples-caching-http-session-background]]
 == Background
@@ -274,4 +277,4 @@ application requirements change and/or your use cases grow.
 HTTP Session state caching is one of the most effective and common ways to utilize caching in your Spring Boot,
 Web applications, and ensure the users experience is first-class.
 
-link:../index.html#geode-samples[Back]
+link:../index.html#geode-samples[Back to Samples]

spring-geode-docs/src/docs/asciidoc/guides/caching-inline.adoc

@@ -30,7 +30,10 @@ guide.  Therefore, it would be helpful to have read that guide before proceeding
 
 Let's begin.
 
-link:../index.html#geode-samples[Back]
+[#index-link]
+link:../index.html[Index]
+
+link:../index.html#geode-samples[Back to Samples]
 
 [[geode-samples-caching-inline-background]]
 == Background
@@ -514,4 +517,4 @@ will serve an important role in reducing the contention and load on the backend
 As you have seen in this guide, the configuration of _Inline Caching_ is very simple to do with Spring Boot
 for Apache Geode (SBDG) when using Spring's Cache Abstraction along with Apache Geode as the caching provider.
 
-link:../index.html#geode-samples[Back]
+link:../index.html#geode-samples[Back to Samples]

spring-geode-docs/src/docs/asciidoc/guides/caching-look-aside.adoc

@@ -26,7 +26,10 @@ _Cache Abstraction_ or Apache Geode is required to utilize caching in your Sprin
 
 Let's begin.
 
-link:../index.html#geode-samples[Back]
+[#index-link]
+link:../index.html[Index]
+
+link:../index.html#geode-samples[Back to Samples]
 
 [[geode-samples-caching-lookaside-background]]
 == Background
@@ -529,4 +532,4 @@ You now have successfully used the _**Look-Aside Caching**_ pattern in your Spri
 Later we will cover more advanced forms of the _Look-Aside Caching_ pattern (e.g. using Eviction/Expiration policies)
 as well as take a look at other caching patterns, like _Inline Caching_ and _Near Caching_.
 
-link:../index.html#geode-samples[Back]
+link:../index.html#geode-samples[Back to Samples]

spring-geode-docs/src/docs/asciidoc/guides/caching-near.adoc

@@ -30,7 +30,10 @@ _Look-Aside Caching_ followed by the guide on _Inline Caching_, first, before co
 
 Let's begin.
 
-link:../index.html#geode-samples[Back]
+[#index-link]
+link:../index.html[Index]
+
+link:../index.html#geode-samples[Back to Samples]
 
 [[geodes-samples-caching-near-background]]
 == Background
@@ -583,4 +586,4 @@ There is a much more that can be achieved with a _Near Cache_, so we leave it as
 to explore and experiment more.  Hopefully this has peaked your curiosity and shown you a few of the benefits of
 applying the _Near Caching_ pattern to your Spring Boot applications.
 
-link:../index.html#geode-samples[Back]
+link:../index.html#geode-samples[Back to Samples]

spring-geode-docs/src/docs/asciidoc/guides/getting-started.adoc

@@ -56,7 +56,10 @@ as the new brand name.
 
 Let's begin!
 
-link:../index.html#geode-samples[Back]
+[#index-link]
+link:../index.html[Index]
+
+link:../index.html#geode-samples[Back to Samples]
 
 [[geode-samples-getting-started-spring-initializer]]
 == Begin with Spring Initializer at start.spring.io
@@ -1979,4 +1982,4 @@ a highly productive and enjoyable experience.
 
 We hope you enjoy!
 
-link:../index.html#geode-samples[Back]
+link:../index.html#geode-samples[Back to Samples]