Update utf8.md (acutally apply fix)

Signed-off-by: Fiona Liao <[email protected]>

Author: fionaliao

content/docs/guides/utf8.md

@@ -97,7 +97,7 @@ OTLP receiver in Prometheus 3.0 still normalizes all names to Prometheus format
       translation_strategy: NoUTF8EscapingWithSuffixes
 
 
-See [OpenTelemetry guide](opentelemetry.md) for more details.
+See [OpenTelemetry guide](/docs/guides/opentelemetry) for more details.
 
 
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