fix incorrect assert for mask face checking, also correct own bad spelling

source/blender/blenkernel/intern/cdderivedmesh.c

@@ -2110,7 +2110,7 @@ void CDDM_calc_normals_mapping_ex(DerivedMesh *dm, const short only_face_normals
 		/* No tessellation on this mesh yet, need to calculate one.
 		 *
 		 * Important not to update face normals from polys since it
-		 * interfears with assigning the new normal layer in the following code.
+		 * interferes with assigning the new normal layer in the following code.
 		 */
 		CDDM_recalc_tessellation_ex(dm, FALSE);
 	}

source/blender/blenkernel/intern/mask_rasterize.c

@@ -64,7 +64,8 @@
 	unsigned int *_t = face;                             \
 	BLI_assert(_t[0] < vert_max);                        \
 	BLI_assert(_t[1] < vert_max);                        \
-	BLI_assert(_t[2] < vert_max || _t[2] == TRI_VERT);   \
+	BLI_assert(_t[2] < vert_max);                        \
+	BLI_assert(_t[3] < vert_max || _t[3] == TRI_VERT);   \
 } (void)0
 
 void rotate_point(const float cent[2], const float angle, float p[2], const float asp[2])
@@ -94,7 +95,7 @@ void rotate_point(const float cent[2], const float angle, float p[2], const floa
 /* --------------------------------------------------------------------- */
 
 /**
- * A single #MaskRasterHandle contains multile #MaskRasterLayer's,
+ * A single #MaskRasterHandle contains multiple #MaskRasterLayer's,
  * each #MaskRasterLayer does its own lookup which contributes to
  * the final pixel with its own blending mode and the final pixel
  * is blended between these.
@@ -801,7 +802,7 @@ void BKE_maskrasterize_handle_init(MaskRasterHandle *mr_handle, struct Mask *mas
 				sf_vert_next = sf_vert->next;
 				copy_v3_v3(cos, sf_vert->co);
 
-				/* remove so as not to interfear with fill (called after) */
+				/* remove so as not to interfere with fill (called after) */
 				if (sf_vert->keyindex == SF_KEYINDEX_TEMP_ID) {
 					BLI_remlink(&sf_ctx.fillvertbase, sf_vert);
 				}
@@ -812,13 +813,13 @@ void BKE_maskrasterize_handle_init(MaskRasterHandle *mr_handle, struct Mask *mas
 				cos += 3;
 			}
 
-			/* main scanfill */
+			/* main scan-fill */
 			sf_tri_tot = BLI_scanfill_calc_ex(&sf_ctx, FALSE, zvec);
 
 			face_array = MEM_mallocN(sizeof(*face_array) * (sf_tri_tot + tot_feather_quads), "maskrast_face_index");
 			face_index = 0;
 
-			/* tri's */
+			/* faces */
 			face = (unsigned int *)face_array;
 			for (sf_tri = sf_ctx.fillfacebase.first; sf_tri; sf_tri = sf_tri->next) {
 				*(face++) = sf_tri->v3->tmp.u;

source/blender/blenlib/intern/math_matrix.c

@@ -1111,7 +1111,7 @@ void mat3_to_rot_size(float rot[3][3], float size[3], float mat3[3][3])
 	/* rotation & scale are linked, we need to create the mat's
 	 * for these together since they are related. */
 
-	/* so scale doesnt interfear with rotation [#24291] */
+	/* so scale doesn't interfere with rotation [#24291] */
 	/* note: this is a workaround for negative matrix not working for rotation conversion, FIXME */
 	normalize_m3_m3(mat3_n, mat3);
 	if (is_negative_m3(mat3)) {

source/blender/editors/sculpt_paint/paint_image.c

@@ -5241,7 +5241,7 @@ static void brush_drawcursor(bContext *C, int x, int y, void *UNUSED(customdata)
 			pixel_size = size;
 		}
 
-		/* fade out the brush (cheap trick to work around brush interfearing with sampling [#])*/
+		/* fade out the brush (cheap trick to work around brush interfering with sampling [#])*/
 		if (pixel_size < PX_SIZE_FADE_MIN) {
 			return;
 		}
@@ -5253,7 +5253,7 @@ static void brush_drawcursor(bContext *C, int x, int y, void *UNUSED(customdata)
 
 		glTranslatef((float)x, (float)y, 0.0f);
 
-		/* No need to scale for uv sculpting, on the contrary it might be useful to keep unscaled */
+		/* No need to scale for uv sculpting, on the contrary it might be useful to keep un-scaled */
 		if (use_zoom)
 			glScalef(zoomx, zoomy, 1.0f);
 

source/blender/windowmanager/intern/wm_operators.c

@@ -1066,7 +1066,7 @@ static uiBlock *wm_block_dialog_create(bContext *C, ARegion *ar, void *userData)
 	/* clear so the OK button is left alone */
 	uiBlockSetFunc(block, NULL, NULL, NULL);
 
-	/* new column so as not to interfear with custom layouts [#26436] */
+	/* new column so as not to interfere with custom layouts [#26436] */
 	{
 		uiBlock *col_block;
 		uiLayout *col;