Add network_mode: bridge to Compose file reference (#24749)

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## Description

Adds documentation for `network_mode: bridge` in the Compose file
reference.

While `bridge` is a valid and functional network_mode option that
connects
containers to the host's default bridge network, it was not documented
alongside the other options (none, host, service, container).

Fixes #24742.

- #24742

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## Reviews

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- [x] Technical review
- [ ] Editorial review
- [ ] Product review

---------

Signed-off-by: Mahitha Adapa <mahitha.ada@gmail.com>
Co-authored-by: Allie Sadler <102604716+aevesdocker@users.noreply.github.com>

Author: mahitha-ada

content/reference/compose-file/services.md

@@ -1334,6 +1334,9 @@ If either is omitted, Compose automatically generates the environment variable n
 
 `network_mode` sets a service container's network mode.
 
+- `bridge`: Connects the container to Docker's default bridge network instead of
+  a project-specific network. Containers on the default bridge network cannot
+  resolve each other by service name . Instead, use a user-defined network for DNS resolution.
 - `none`: Turns off all container networking.
 - `host`: Gives the container raw access to the host's network interface.
 - `service:{name}`: Gives the container access to the specified container by referring to its service name.
@@ -1342,6 +1345,7 @@ If either is omitted, Compose automatically generates the environment variable n
 For more information container networks, see the [Docker Engine documentation](/manuals/engine/network/_index.md#container-networks).
 
 ```yml
+    network_mode: "bridge"
     network_mode: "host"
     network_mode: "none"
     network_mode: "service:[service name]"