bug 14921 part 3: typos

Nothing to do.

https://cvs.khronos.org/bugzilla/show_bug.cgi?id=14921
diff --git a/vulkan.py b/vulkan.py
index 73134d0..9336713 100755
--- a/vulkan.py
+++ b/vulkan.py
@@ -694,12 +694,12 @@
 
         Proto("void", "DestroyCommandPool",
             [Param("VkDevice", "device"),
-             Param("VkCommandPool", "CommandPool"),
+             Param("VkCommandPool", "commandPool"),
              Param("const VkAllocationCallbacks*", "pAllocator")]),
 
         Proto("VkResult", "ResetCommandPool",
             [Param("VkDevice", "device"),
-             Param("VkCommandPool", "CommandPool"),
+             Param("VkCommandPool", "commandPool"),
              Param("VkCommandPoolResetFlags", "flags")]),
 
         Proto("VkResult", "AllocateCommandBuffers",
@@ -709,7 +709,7 @@
 
         Proto("void", "FreeCommandBuffers",
             [Param("VkDevice", "device"),
-             Param("VkCommandPool", "CommandPool"),
+             Param("VkCommandPool", "commandPool"),
              Param("uint32_t", "commandBufferCount"),
              Param("const VkCommandBuffer*", "pCommandBuffers")]),