[JENKINS-25002] Added a java comment explaining the use of the limit …

…on the split function

plugin/src/main/java/hudson/plugins/swarm/PluginImpl.java

@@ -81,6 +81,7 @@ public void doCreateSlave(StaplerRequest req, StaplerResponse rsp, @QueryParamet
 		String[] toolLocsArray = toolLocations.split(" ");
 		for (String toolLocKeyValue : toolLocsArray) {
 			boolean found = false;
+			// limit the split on only the first occurence of ':', so that the tool location path can contain ':' characters
 			String[] toolLoc = toolLocKeyValue.split(":", 2);
 
 			for (ToolDescriptor<?> desc : ToolInstallation.all()) {