Remove duplicate lines from Pipeline overview (#7611)

Update index.adoc

Removed the documentation repetition in 5th and 7th points.

Co-authored-by: Kevin Martens <99040580+kmartens27@users.noreply.github.com>

content/doc/book/pipeline/index.adoc

@@ -348,8 +348,5 @@ plugin:workflow-durable-task-step[Pipeline: Nodes and Processes plugin]) that
 executes the given shell command.
 <6> `junit` is another Pipeline link:syntax#steps[step] (provided by the
 plugin:junit[JUnit plugin]) for aggregating test reports.
-<7> `sh` is a Pipeline link:syntax#steps[step] (provided by the
-plugin:workflow-durable-task-step[Pipeline: Nodes and Processes plugin]) that
-executes the given shell command.
 
 Read more about Pipeline syntax on the link:syntax[Pipeline Syntax] page.