Clarify usage for weapon capacity natives

This PR renames the weapon capacity natives to match the original names
and also clarifies where these weapon indexes are meant to be found.

VEHICLE/GetVehicleWeaponRestrictedAmmo.md

@@ -0,0 +1,18 @@
+---
+ns: VEHICLE
+aliases: ["0x8181CE2F25CB9BB7", "_GET_VEHICLE_WEAPON_CAPACITY"]
+---
+## GET_VEHICLE_WEAPON_RESTRICTED_AMMO
+
+```c
+// 0x8181CE2F25CB9BB7
+int GET_VEHICLE_WEAPON_RESTRICTED_AMMO(Vehicle vehicle, int weaponIndex);
+```
+
+
+## Parameters
+* **vehicle**: The vehicle handle
+* **weaponIndex**: The weapon index we're getting ammo for (see [SET_VEHICLE_WEAPON_RESTRICTED_AMMO](#_0x44CD1F493DB2A0A6) for information on how to access these slots).
+
+## Return value
+Gets the current restricted ammo count for a particular vehicle weapon index on a vehicle.

VEHICLE/SetVehicleWeaponRestrictedAmmo.md

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+---
+ns: VEHICLE
+aliases: ["0x44CD1F493DB2A0A6", "_SET_VEHICLE_WEAPON_CAPACITY"]
+---
+## SET_VEHICLE_WEAPON_RESTRICTED_AMMO
+
+```c
+// 0x44CD1F493DB2A0A6
+void SET_VEHICLE_WEAPON_RESTRICTED_AMMO(Vehicle vehicle, int weaponIndex, int ammoCount);
+```
+Sets a limited number of ammo for a particular vehicle weapon index on a vehicle.  
+
+Information about weapon indexes can be found in `handling.meta`. 
+
+In the example given below, `uWeaponHash` defines weapon hashes for the vehicle. Each `<Item>` corresponds to an index starting from `0`.
+
+```
+<uWeaponHash>
+    <Item>VEHICLE_WEAPON_PLAYER_BUZZARD</Item>  <!-- Index: 0 -->
+    <Item>VEHICLE_WEAPON_SPACE_ROCKET</Item>    <!-- Index: 1 -->
+    <Item>VEHICLE_WEAPON_SEARCHLIGHT</Item>     <!-- Index: 2 -->
+</uWeaponHash>
+```
+
+## Parameters
+* **vehicle**: The vehicle handle
+* **weaponIndex**: The weapon index we're setting ammo for (between `0` and `3`), see description for more.
+* **ammoCount**: When set positive, will count down with every fire and prevent firing at `0`. Set `-1` to disable restricted ammo.
+