[Docs] Adapt //TESTREPONSE for Windows platforms

 This commit adapts a //TESTRESPONSE check in the getting-started.asciidoc because the Load Average is not available on Windows platforms.

docs/reference/getting-started.asciidoc

@@ -236,7 +236,7 @@ And the response:
 ip        heap.percent ram.percent cpu load_1m load_5m load_15m node.role master name
 127.0.0.1           10           5   5    4.46                        mdi      *      PB2SGZY
 --------------------------------------------------
-// TESTRESPONSE[s/10           5   5    4.46/\\d+ \\d+ \\d+ \\d+\\.\\d+ (\\d+\\.\\d+)? (\\d+\.\\d+)?/]
+// TESTRESPONSE[s/10           5   5    4.46/\\d+ \\d+ \\d+ (\\d+\\.\\d+)? (\\d+\\.\\d+)? (\\d+\.\\d+)?/]
 // TESTRESPONSE[s/[*]/[*]/ s/PB2SGZY/.+/ _cat]
 
 Here, we can see our one node named "I8hydUG", which is the single node that is currently in our cluster.