docs: fix typos in openmetrics.md

Author: armandgrillet

docs/openmetrics.md

@@ -1,9 +1,9 @@
-# OpenMetrics/Promethus telemetry
+# OpenMetrics/Prometheus telemetry
 
-Various server statistics is provided in OpenMetrics format by "openmetrics"
-module.
+Various server statistics are provided in OpenMetrics format by the
+"openmetrics" module.
 
-To enable it, add following line to the server config:
+To enable it, add the following line to the server config:
 ```
 openmetrics tcp://127.0.0.1:9749 { }
 ```
@@ -19,22 +19,22 @@ maddy_smtp_failed_logins{module}
 maddy_smtp_failed_commands{module, command, smtp_code, smtp_enchcode}
 # Messages rejected with 4xx code due to ratelimiting.
 maddy_smtp_ratelimit_deferred{module}
-# Amount of started SMTP trasanactions started.
+# Amount of started SMTP transactions started.
 maddy_smtp_started_transactions{module}
-# Amount of aborted SMTP trasanactions started.
+# Amount of aborted SMTP transactions started.
 maddy_smtp_aborted_transactions{module}
-# Amount of completed SMTP trasanactions.
+# Amount of completed SMTP transactions.
 maddy_smtp_completed_transactions{module}
 # Number of times a check returned 'reject' result (may be more than processed
-# messages if check does so on per-recipient basis)
+# messages if check does so on per-recipient basis).
 maddy_check_reject{check}
 # Number of times a check returned 'quarantine' result (may be more than
 # processed messages if check does so on per-recipient basis).
 maddy_check_quarantined{check}
-# Amount of queued messages
+# Amount of queued messages.
 maddy_queue_length{module, location}
-# Outbound connections established with specific TLS security level
+# Outbound connections established with specific TLS security level.
 maddy_remote_conns_tls_level{module, level}
-# Outbound connections established with specific MX security level
+# Outbound connections established with specific MX security level.
 maddy_remote_conns_mx_level{module, level}
 ```