docs: fix typo

Author: hacdias

docs/tracing.md

@@ -122,8 +122,8 @@ To generate a valid `Traceparent` header value, the following script can be used
 version="00" # fixed in spec at 00
 trace_id="$(cat /dev/urandom | tr -dc 'a-f0-9' | fold -w 32 | head -n 1)"
 parent_id="00$(cat /dev/urandom | tr -dc 'a-f0-9' | fold -w 14 | head -n 1)"
-tace_flag="01"   # sampled
-traceparent="$version-$trace_id-$parent_id-$tace_flag"
+trace_flag="01"   # sampled
+traceparent="$version-$trace_id-$parent_id-$trace_flag"
 echo $traceparent
 ```