[DOCS] Updates compatibility documentation

Author: picandocodigo

README.md

@@ -55,7 +55,7 @@ see the **[elasticsearch-rails](https://github.com/elasticsearch/elasticsearch-r
 
 We follow Ruby’s own maintenance policy and officially support all currently maintained versions per [Ruby Maintenance Branches](https://www.ruby-lang.org/en/downloads/branches/).
 
-Language clients are forward compatible; meaning that clients support communicating with greater minor versions of Elasticsearch. Elastic language clients are also backwards compatible with lesser supported minor Elasticsearch versions.
+Language clients are forward compatible; meaning that clients support communicating with greater or equal minor versions of Elasticsearch. Elasticsearch language clients are only backwards compatible with default distributions and without guarantees made.
 
 ## Installation
 

docs/installation.asciidoc

@@ -40,16 +40,4 @@ gem 'elasticsearch', '~> 7.0'
 
 The {es} client is compatible with currently maintained Ruby versions. We follow Ruby’s own maintenance policy and officially support all currently maintained versions per https://www.ruby-lang.org/en/downloads/branches/[Ruby Maintenance Branches].
 
-Language clients are forward compatible; meaning that clients support communicating with greater minor versions of {es}. Elastic language clients are also backwards compatible with lesser supported minor {es} versions.
-
-|===
-| Gem Version   |   | {es} Version
-
-| 0.90          | → | 0.90
-| 1.x           | → | 1.x
-| 2.x           | → | 2.x
-| 5.x           | → | 5.x
-| 6.x           | → | 6.x
-| 7.x           | → | 7.x
-| master        | → | master
-|===
+Language clients are forward compatible; meaning that clients support communicating with greater or equal minor versions of {es}. Elasticsearch language clients are only backwards compatible with default distributions and without guarantees made.