fix some formatting issues (#2685)

Author: renetapopova

modules/ROOT/pages/installation/osx.adoc

@@ -109,14 +109,14 @@ Here are the steps to uninstall Neo4j on macOS:
 . Stop all Neo4j running services:
 +
 [source, shell]
----
+----
 sudo systemctl stop neo4j
 sudo systemctl disable neo4j
----
+----
 . Delete _NEO4J_HOME_ and the file _/lib/systemd/system/neo4j.service_:
 +
 [source, shell]
----
+----
 rm /lib/systemd/system/neo4j.service
 rm -rf NEO4J_HOME
----
+----

modules/ROOT/pages/installation/windows.adoc

@@ -260,12 +260,12 @@ Here are the steps to uninstall Neo4j on Windows:
 . Uninstall the Neo4j Windows service:
 +
 [source, shell]
----
+----
 %NEO4J_HOME%\bin\neo4j windows-service uninstall
----
+----
 . Delete _NEO4J_HOME_:
 +
 [source, shell]
----
+----
 rmdir NEO4J_HOME
----
+----