Fix pre-existing comment typos

Shit happens

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/LightLoop/lightlistbuild-clustered.compute

 		InterlockedAdd(g_LayeredSingleIdxBuffer[0], (uint) iSpaceAvail, start);		// alloc list memory
 	}
 
-	// All our cull data are in the same list, but at render time envLights are separated so we need to shit the index
+	// All our cull data are in the same list, but at render time envLights are separated so we need to shift the index
 	// to make it work correctly
 	int shiftIndex[LIGHTCATEGORY_COUNT];
 	ZERO_INITIALIZE_ARRAY(int, shiftIndex, LIGHTCATEGORY_COUNT);

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/LightLoop/lightlistbuild.compute

 	int localOffs=0;
 	int offs = tileIDX.y*nrTilesX + tileIDX.x;
 
-	// All our cull data are in the same list, but at render time envLights are separated so we need to shit the index
+	// All our cull data are in the same list, but at render time envLights are separated so we need to shift the index
 	// to make it work correctly
 	int shiftIndex[LIGHTCATEGORY_COUNT];
 	ZERO_INITIALIZE_ARRAY(int, shiftIndex, LIGHTCATEGORY_COUNT);