docs: fix typos in source code comments

src/component/legend/ScrollableLegendView.ts

@@ -437,7 +437,7 @@ class ScrollableLegendView extends LegendView {
         // Strategy:
         // (1) Always align based on the left/top most item.
         // (2) It is user-friendly that the last item shown in the
-        // current window is shown at the begining of next window.
+        // current window is shown at the beginning of next window.
         // Otherwise if half of the last item is cut by the window,
         // it will have no chance to display entirely.
         // (3) Consider that item size probably be different, we

src/coord/matrix/MatrixBodyCorner.ts

@@ -54,7 +54,7 @@ export interface MatrixBodyCornerCell {
     option: MatrixBodyCornerCellOption | NullUndefined;
     // `matrix.body/corner.data[i].coord` can locate a rect of cells (say, area).
     // `inSpanOf` refers to the top-left cell, which represents that area.
-    // The top-left cell has `inSpanOf` refering to itself.
+    // The top-left cell has `inSpanOf` referring to itself.
     inSpanOf: MatrixBodyCornerCell | NullUndefined;
     // If existing, it indicates cell merging, and this cell is the top-left cell
     // of the merging area.

src/util/graphic.ts

@@ -884,7 +884,7 @@ function doUpdateZ(
         label.z = z;
         label.zlevel = zlevel;
         // lift z2 of text content
-        // TODO if el.emphasis.z2 is spcefied, what about textContent.
+        // TODO if el.emphasis.z2 is specified, what about textContent.
         isFinite(maxZ2) && (label.z2 = maxZ2 + 2);
     }
     if (labelLine) {