Include `pointing_device_send` in docs (#9185)

docs/feature_pointing_device.md

@@ -21,7 +21,11 @@ Keep in mind that a report_mouse_t (here "mouseReport") has the following proper
 * `mouseReport.h` - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing horizontal scrolling (+ right, - left).
 * `mouseReport.buttons` - this is a uint8_t in which the last 5 bits are used.  These bits represent the mouse button state - bit 3 is mouse button 5, and bit 7 is mouse button 1.
 
-When the mouse report is sent, the x, y, v, and h values are set to 0 (this is done in "pointing_device_send()", which can be overridden to avoid this behavior).  This way, button states persist, but movement will only occur once.  For further customization, both `pointing_device_init` and `pointing_device_task` can be overridden.
+Once you have made the necessary changes to the mouse report, you need to send it:
+
+* `pointing_device_send()` - Sends the mouse report to the host and zeroes out the report. 
+
+When the mouse report is sent, the x, y, v, and h values are set to 0 (this is done in `pointing_device_send()`, which can be overridden to avoid this behavior).  This way, button states persist, but movement will only occur once.  For further customization, both `pointing_device_init` and `pointing_device_task` can be overridden.
 
 In the following example, a custom key is used to click the mouse and scroll 127 units vertically and horizontally, then undo all of that when released - because that's a totally useful function.  Listen, this is an example:
 
@@ -38,6 +42,7 @@ case MS_SPECIAL:
         currentReport.buttons &= ~MOUSE_BTN1;
     }
     pointing_device_set_report(currentReport);
+    pointing_device_send();
     break;
 ```