Update childkey proportion CLI argument in docs

Author: HudsonGraeme

bittensor_cli/cli.py

@@ -4539,7 +4539,7 @@ def stake_set_children(
 
         EXAMPLE
 
-        [green]$[/green] btcli stake child set -c 5FCL3gmjtQV4xxxxuEPEFQVhyyyyqYgNwX7drFLw7MSdBnxP -c 5Hp5dxxxxtGg7pu8dN2btyyyyVA1vELmM9dy8KQv3LxV8PA7 --hotkey default --netuid 1 -p 0.3 -p 0.7
+        [green]$[/green] btcli stake child set -c 5FCL3gmjtQV4xxxxuEPEFQVhyyyyqYgNwX7drFLw7MSdBnxP -c 5Hp5dxxxxtGg7pu8dN2btyyyyVA1vELmM9dy8KQv3LxV8PA7 --hotkey default --netuid 1 --prop 0.3 --prop 0.7
         """
         self.verbosity_handler(quiet, verbose, json_output)
         netuid = get_optional_netuid(netuid, all_netuids)