just some comment fixes

source/blender/blenkernel/BKE_shrinkwrap.h

@@ -115,9 +115,9 @@ typedef struct ShrinkwrapCalcData
 	int vgroup;						//Vertex group num
 
 	struct DerivedMesh *target;		//mesh we are shrinking to	
-	SpaceTransform local2target;	//transform to move bettwem local and target space
+	SpaceTransform local2target;	//transform to move between local and target space
 
-	float keepDist;					//Distance to kept from target (units are in local space)
+	float keepDist;					//Distance to keep above target surface (units are in local space)
 
 } ShrinkwrapCalcData;
 

source/blender/blenkernel/intern/shrinkwrap.c

@@ -574,7 +574,7 @@ void shrinkwrapModifier_deform(ShrinkwrapModifierData *smd, Scene *scene, Object
 				}
 			}
 
-			//Just to make sure we are not letting any memory behind
+			//Just to make sure we are not leaving any memory behind
 			assert(ssmd.emCache == NULL);
 			assert(ssmd.mCache == NULL);
 		}