fix metric_name_escaping_scheme option (#16625)

docs/configuration/configuration.md

@@ -481,7 +481,7 @@ metric_relabel_configs:
 # Specifies the validation scheme for metric and label names. Either blank or 
 # "utf8" for full UTF-8 support, or "legacy" for letters, numbers, colons, and
 # underscores.
-[ metric_name_validation_scheme <string> | default "utf8" ]
+[ metric_name_validation_scheme: <string> | default "utf8" ]
 
 # Specifies the character escaping scheme that will be requested when scraping
 # for metric and label names that do not conform to the legacy Prometheus
@@ -497,7 +497,7 @@ metric_relabel_configs:
 # If this value is left blank, Prometheus will default to `allow-utf-8` if the
 # validation scheme for the current scrape config is set to utf8, or
 # `underscores` if the validation scheme is set to `legacy`.
-[ metric_name_validation_scheme <string> | default "utf8" ]
+[ metric_name_escaping_scheme: <string> | default "allow-utf-8" ]
 
 # Limit on total number of positive and negative buckets allowed in a single
 # native histogram. The resolution of a histogram with more buckets will be