docs: Update recording rule docs about native histograms

Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>

docs/configuration/recording_rules.md

@@ -17,9 +17,9 @@ Rule files use YAML.
 The rule files can be reloaded at runtime by sending `SIGHUP` to the Prometheus
 process. The changes are only applied if all rule files are well-formatted.
 
-_Note about native histograms (experimental feature): Rules evaluating to
-native histograms do not yet work as expected. Instead of a native histogram,
-the sample stored is just a floating point value of zero._
+_Note about native histograms (experimental feature): Native histogram are always
+recorded as gauge histograms (for now). Most cases will create gauge histograms
+naturally, e.g. after `rate()`._
 
 ## Syntax-checking rules