Tests: Improve size regex in documentation test
The regex has been changed to not only be able to deal with something
like `260b`, but also support `1.1kb`.
@@ -368,7 +368,7 @@ And the response:
health status index uuid pri rep docs.count docs.deleted store.size pri.store.size
yellow open customer 95SQ4TSUT7mWBT7VNHH67A 5 1 0 0 260b 260b
--------------------------------------------------
-// TESTRESPONSE[s/95SQ4TSUT7mWBT7VNHH67A/.+/ s/260b/\\d+b/ _cat]
+// TESTRESPONSE[s/95SQ4TSUT7mWBT7VNHH67A/.+/ s/260b/\\d+\\.?\\d?k?b/ _cat]
The results of the second command tells us that we now have 1 index named customer and it has 5 primary shards and 1 replica (the defaults) and it contains 0 documents in it.
