Update docs.

FULL_HELP_DOCS.md

@@ -1284,15 +1284,13 @@ Calculate the hash of a transaction envelope from stdin
 
 Sign a transaction envelope appending the signature to the envelope
 
-**Usage:** `stellar tx sign [OPTIONS]`
+**Usage:** `stellar tx sign [OPTIONS] --network <NETWORK>`
 
 ###### **Options:**
 
 * `--sign-with-key <SIGN_WITH_KEY>` — Sign with a local key. Can be an identity (--sign-with-key alice), a secret key (--sign-with-key SC36…), or a seed phrase (--sign-with-key "kite urban…"). If using seed phrase, `--hd-path` defaults to the `0` path
 * `--hd-path <HD_PATH>` — If using a seed phrase to sign, sets which hierarchical deterministic path to use, e.g. `m/44'/148'/{hd_path}`. Example: `--hd-path 1`. Default: `0`
 * `--sign-with-lab` — Sign with https://lab.stellar.org
-* `--rpc-url <RPC_URL>` — RPC server endpoint
-* `--network-passphrase <NETWORK_PASSPHRASE>` — Network passphrase to sign the transaction sent to the rpc server
 * `--network <NETWORK>` — Name of network to use from config
 * `--global` — Use global config
 * `--config-dir <CONFIG_DIR>` — Location of config directory, default is "."
@@ -1303,12 +1301,10 @@ Sign a transaction envelope appending the signature to the envelope
 
 Send a transaction envelope to the network
 
-**Usage:** `stellar tx send [OPTIONS]`
+**Usage:** `stellar tx send [OPTIONS] --network <NETWORK>`
 
 ###### **Options:**
 
-* `--rpc-url <RPC_URL>` — RPC server endpoint
-* `--network-passphrase <NETWORK_PASSPHRASE>` — Network passphrase to sign the transaction sent to the rpc server
 * `--network <NETWORK>` — Name of network to use from config
 * `--global` — Use global config
 * `--config-dir <CONFIG_DIR>` — Location of config directory, default is "."