Editing pass

Edited for spelling, puncuation, grammar, usage, and corporate voice.

spring-shell-docs/src/main/asciidoc/index.adoc

@@ -15,7 +15,7 @@ ifdef::backend-pdf[]
 NOTE: This documentation is also available as https://docs.spring.io/spring-shell/docs/{projectVersion}/reference/htmlsingle/index.html[HTML].
 endif::[]
 
-(C) 2017 Pivotal Software, Inc.
+(C) 2017 - 2020 Pivotal Software, Inc.
 
 _Copies of this document may be made for your own use and for distribution to
 others, provided that you do not charge any fee for such copies and further

spring-shell-docs/src/main/asciidoc/what-is-spring-shell.adoc

@@ -1,16 +1,15 @@
 == What is Spring Shell?
 
 Not all applications need a fancy web user interface!
-Sometimes, interacting with an application using an interactive terminal is
+Sometimes, interacting with an application through an interactive terminal is
 the most appropriate way to get things done.
 
-Spring Shell allows one to easily create such a runnable application, where the
-user will enter textual commands that will get executed until the program terminates.
+Spring Shell lets you create such a runnable application, where the
+user enters textual commands that are run until the program terminates.
 The Spring Shell project provides the infrastructure to create such a REPL (Read, Eval,
-Print Loop), allowing the developer to concentrate on the commands implementation, using
+Print Loop), letting you concentrate on the commands implementation by using
 the familiar Spring programming model.
 
-Advanced features such as parsing, kbd:[TAB] completion, colorization of output, fancy ascii-art
-table display, input conversion and validation all come for free, with the developer only
-having to focus on core command logic.
-
+Advanced features such as parsing, tab completion, colorization of output, fancy ascii-art
+table display, input conversion, and validation are all include, freeing you
+to focus on core command logic.