"in the Jenkins environment" as a means for referring to the collecti…

…ve resources

This comes after some discussion with @omehegan on how to refer to the concept

STYLEGUIDE.adoc

@@ -10,6 +10,7 @@ CAUTION: This document is still a work in progress.
 * Master
 * Node
 * Pipeline
+* Executor
 
 Mixing of these terms is incorrect
 
@@ -18,6 +19,17 @@ should always be title-cased. When referring to a conceptual pipeline
 ("continuous delivery pipeline"), it it should always be lower-cased.
 
 
+When needing to refer to the collection of executors and/or nodes it is best to
+refer to them collective as "the Jenkins environment", for example:
+
+____
+[..] they will now execute in parallel assuming the requisite capacity exists
+in the Jenkins environment.
+____
+
+As opposed to "the Jenkins cluster", "agent pool" or any other phrase to
+describe the collective set of resources provided by Jenkins.
+
 == Syntax/Formatting
 
 Below are some tips for keeping documentation consistently formatted to ensure

content/doc/book/pipeline/getting-started.adoc

@@ -100,7 +100,7 @@ node { // <1>
     echo 'Hello World' // <2>
 }
 ----
-<1> `node` allocates an executor and workspace on the Jenkins cluster.
+<1> `node` allocates an executor and workspace in the Jenkins environment.
 <2> `echo` writes simple string in the Console Output.
 
 

content/doc/book/pipeline/jenkinsfile.adoc

@@ -53,7 +53,7 @@ node { // <1>
     }
 }
 ----
-<1> `node` allocates an executor and workspace on the Jenkins cluster.
+<1> `node` allocates an executor and workspace in the Jenkins environment.
 <2> `stage` describes distinct parts of the Pipeline for better visualization of progress/status.
 
 Not all Pipelines will have these same three stages, but this is a good
@@ -445,7 +445,7 @@ stage('Test') {
 
 Instead of executing the tests on the "linux" and "windows" labelled nodes in
 series, they will now execute in parallel assuming the requisite capacity
-exists in the Jenkins cluster.
+exists in the Jenkins environment.
 
 
 === Optional step arguments