remove uncomressed content length after discussion in open-telemetry#2028

Author: lmolkova

specification/trace/semantic_conventions/http.md

@@ -68,9 +68,7 @@ Don't set the span status description if the reason can be inferred from `http.s
 | `http.flavor` | string | Kind of HTTP protocol used. [1] | `1.0` | Opt-out |
 | `http.user_agent` | string | Value of the [HTTP User-Agent](https://tools.ietf.org/html/rfc7231#section-5.5.3) header sent by the client. | `CERN-LineMode/2.15 libwww/2.17b3` | Opt-out |
 | `http.request_content_length` | int | The size of the request payload body in bytes. This is the number of bytes transferred excluding headers and is often, but not always, present as the [Content-Length](https://tools.ietf.org/html/rfc7230#section-3.3.2) header. For requests using transport encoding, this should be the compressed size. | `3495` | Opt-in |
-| `http.request_content_length_uncompressed` | int | The size of the uncompressed request payload body after transport decoding. Not set if transport encoding not used. | `5493` | Opt-in |
 | `http.response_content_length` | int | The size of the response payload body in bytes. This is the number of bytes transferred excluding headers and is often, but not always, present as the [Content-Length](https://tools.ietf.org/html/rfc7230#section-3.3.2) header. For requests using transport encoding, this should be the compressed size. | `3495` | Opt-in |
-| `http.response_content_length_uncompressed` | int | The size of the uncompressed response payload body after transport decoding. Not set if transport encoding not used. | `5493` | Opt-in |
 
 **[1]:** If `net.transport` is not specified, it can be assumed to be `IP.TCP` except if `http.flavor` is `QUIC`, in which case `IP.UDP` is assumed.