docs: refer to boxo/docs/tracing.md

Author: lidel

docs/headers.md

@@ -11,16 +11,9 @@ Optional. Clients may use this header to return a additional vendor-specific tra
 Currently ignored unless `Authorization` matches [`RAINBOW_TRACING_AUTH`](./environment-variables.md#rainbow_tracing_auth).
 
 > [!TIP]
-> `Traceparent` value format is `00-32HEX-16HEX-2HEX`, for example:
-> ```
-> Traceparent: 00-4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-00
-> base16(version) = 00 // version, currently always 00
-> base16(trace-id) = 4bf92f3577b34da6a3ce929d0e0e4736
-> base16(parent-id) = 00f067aa0ba902b7
-> base16(trace-flags) = 00  // 00 means not sampled (manual), 01 means sampled
-> ```
-> 
-> See [W3C Trace Context Specification](https://www.w3.org/TR/trace-context-1/#trace-context-http-headers-format) for more details.
+> `Traceparent` value format can be found in [W3C Trace Context Specification](https://www.w3.org/TR/trace-context-1/#trace-context-http-headers-format).
+>
+> Sample code for generating it can be found in [boxo/docs/tracing.md](https://github.com/ipfs/boxo/blob/main/docs/tracing.md#generate-traceparent-header)
 
 ## `Tracestate`
 
@@ -29,8 +22,7 @@ Optional. Clients may use this header to return a additional vendor-specific tra
 Currently ignored unless `Authorization` matches [`RAINBOW_TRACING_AUTH`](./environment-variables.md#rainbow_tracing_auth).
 
 > [!TIP]
-> `Tracestate` value format is 
-> See [W3C Trace Context Specification](https://www.w3.org/TR/trace-context-1/#trace-context-http-headers-format).
+> `Tracestate` value format can be found in [W3C Trace Context Specification](https://www.w3.org/TR/trace-context-1/#trace-context-http-headers-format).
 
 ## Rainbow-No-Blockcache