fix type

Co-authored-by: J. Kalyana Sundaram <[email protected]>

Author: basti1302

spec/21-http_response_header_format.md

@@ -107,7 +107,7 @@ When a participant starts or restarts a trace (that is, when the participant gen
 
 A participant that continues a trace started upstream — that is, if the participant uses the `trace-id` value from an incoming `traceparent` header in its own `traceresponse` header — MUST set the `random-trace-id` flag in the `traceresponse` header to the same value that was found in the incoming `traceparent` header.
 
-A participant that continues a trace started downstream — that is, if the participant uses the `trace-id` value from a `traceresponse` header it has receieved — MUST set the `random-trace-id` flag in its own `traceresponse` header to the same value that was found in the `traceresponse` header from which the `trace-id` was taken.
+A participant that continues a trace started downstream — that is, if the participant uses the `trace-id` value from a `traceresponse` header it has received — MUST set the `random-trace-id` flag in its own `traceresponse` header to the same value that was found in the `traceresponse` header from which the `trace-id` was taken.
 
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