Added hot_reload to service section yaml configuration with example. (#1592)

* Added hot_reload to service section yaml configuration with example.

Signed-off-by: Eric D. Schabell <eric@schabell.org>

* Added link to hot_reload doc page.

Signed-off-by: Eric D. Schabell <eric@schabell.org>

* Update administration/configuring-fluent-bit/yaml/service-section.md

Signed-off-by: Pat <patrick.j.k.stephens@gmail.com>

---------

Signed-off-by: Eric D. Schabell <eric@schabell.org>
Signed-off-by: Pat <patrick.j.k.stephens@gmail.com>
Co-authored-by: Pat <patrick.j.k.stephens@gmail.com>

Author: eschabell

administration/configuring-fluent-bit/yaml/service-section.md

@@ -16,6 +16,7 @@ The `service` section defines global properties of the service. The available co
 | `http_server` | Enables the built-in HTTP Server. | `off` |
 | `http_listen` | Sets the listening interface for the HTTP Server when it's enabled. | `0.0.0.0` |
 | `http_port` | Sets the TCP port for the HTTP Server. | `2020` |
+| `hot_reload` | Enables hot [reloading](../../hot_reload.md) of configuration with SIGHUP. | `on` |
 | `coro_stack_size` | Sets the coroutine stack size in bytes. The value must be greater than the page size of the running system. Setting the value too small (`4096`) can cause coroutine threads to overrun the stack buffer. The default value of this parameter should not be changed. | `24576` |
 | `scheduler.cap` | Sets a maximum retry time in seconds. Supported in v1.8.7 and greater. | `2000` |
 | `scheduler.base` | Sets the base of exponential backoff. Supported in v1.8.7 and greater. | `5` |
@@ -24,7 +25,7 @@ The `service` section defines global properties of the service. The available co
 
 ### Configuration Example
 
-Below is a simple configuration example that defines a `service` section and a pipeline with a `random` input and `stdout` output:
+Below is a simple configuration example that defines a `service` section with [hot reloading](../../hot_reload.md) enabled and a pipeline with a `random` input and `stdout` output:
 
 ```yaml
 service:
@@ -33,6 +34,7 @@ service:
   http_server: true
   http_listen: 0.0.0.0
   http_port: 2020
+  hot_reload: on
 
 pipeline:
   inputs: