[DOCS] Updates docs based on review

Co-authored-by: István Zoltán Szabó <[email protected]>

Author: picandocodigo

README.md

@@ -57,7 +57,7 @@ We follow Ruby’s own maintenance policy and officially support all currently m
 
 Elastic language clients are guaranteed to be able to communicate with Elasticsearch or Elastic solutions running on the same major version and greater or equal minor version.
 
-Language clients are forward compatible; meaning that clients support communicating with greater minor versions of Elasticsearch. Elastic language clients are not guaranteed to be backwards compatible.
+Language clients are forward compatible; meaning that clients support communicating with greater minor versions of Elasticsearch. Elastic language clients are not guaranteed to be backward compatible.
 
 The gem's version numbers follow Elasticsearch's major versions. The `master` branch is compatible with the Elasticsearch `master` branch, which is the next major version.
 

docs/installation.asciidoc

@@ -40,9 +40,9 @@ 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].
 
-Elastic language clients are guaranteed to be able to communicate with Elasticsearch or Elastic solutions running on the same major version and greater or equal minor version.
+Elastic language clients are guaranteed to be able to communicate with {es} or Elastic solutions running on the same major version and greater or equal minor version.
 
-Language clients are forward compatible; meaning that clients support communicating with greater minor versions of Elasticsearch. Elastic language clients are not guaranteed to be backwards compatible.
+Language clients are forward compatible; meaning that clients support communicating with greater minor versions of {es}. Elastic language clients are not guaranteed to be backward compatible.
 
 |===
 | Gem Version   |   | {es} Version