config/network: add groups for network managers

Author: cinerea0

src/config/network/connman.md

@@ -15,6 +15,8 @@ Finally, enable the `connmand` service.
 
 ## Configuring ConnMan
 
+Users of ConnMan must belong to the `network` group.
+
 ### ConnMan CLI
 
 The `connman` package includes a command line tool,

src/config/network/iwd.md

@@ -15,8 +15,8 @@ as arguments; when run without arguments, it provides an interactive session. To
 list available commands, run `iwctl help`, or run `iwctl` and enter `help` at
 the interactive prompt.
 
-By default, only the root user and those in the `wheel` group have permission to
-operate `iwctl`.
+By default, only the root user and those in the `wheel` or `netdev` groups have
+permission to operate `iwctl`.
 
 ## Configuration
 

src/config/network/wpa_supplicant.md

@@ -17,6 +17,10 @@ pre-shared keys for use in configuration files.
 [wpa_cli(8)](https://man.voidlinux.org/wpa_cli.8) provides a CLI for managing
 the `wpa_supplicant` daemon.
 
+You must be a member of the group assigned as the `ctrl_interface_group` in the
+configuration file to interact with `wpa_supplicant`. On Void, this defaults to
+`wheel`.
+
 ## WPA-PSK
 
 To use WPA-PSK, generate a pre-shared key with