Fixups to canvas text and state

Fix some typos in the canvas text styles section that were introduced in4d93c06fa604021b7c582940e1a419378237bf44.

Use the current filter and current composition operator in the canvas state section, instead of the public getters, per whatwg#7378 (comment).

source

@@ -61826,8 +61826,10 @@ context.fillRect(100,0,50,50); // only this square remains</code></pre>
    <li>The current <span>clipping region</span>.</li>
    <li>The current <span data-x="concept-CanvasTextDrawingStyles-letter-spacing">letter
    spacing</span>, <span data-x="concept-CanvasTextDrawingStyles-word-spacing">word
-   spacing</span>, <span data-x="concept-CanvasFillStrokeStyles-fill-style">fill style</span>, and
-   <span data-x="concept-CanvasFillStrokeStyles-stroke-style">stroke style</span>.</li>
+   spacing</span>, <span data-x="concept-CanvasFillStrokeStyles-fill-style">fill style</span>,
+   <span data-x="concept-CanvasFillStrokeStyles-stroke-style">stroke style</span>, <span
+   data-x="concept-canvas-current-filter">filter</span>, and <span
+   data-x="current composition operator">composition operator</span>.</li>
    <li>The current values of the following attributes: <code
    data-x="dom-context-2d-globalAlpha">globalAlpha</code>, <code
    data-x="dom-context-2d-lineWidth">lineWidth</code>, <code
@@ -61839,8 +61841,6 @@ context.fillRect(100,0,50,50); // only this square remains</code></pre>
    data-x="dom-context-2d-shadowOffsetY">shadowOffsetY</code>, <code
    data-x="dom-context-2d-shadowBlur">shadowBlur</code>, <code
    data-x="dom-context-2d-shadowColor">shadowColor</code>, <code
-   data-x="dom-context-2d-filter">filter</code>, <code
-   data-x="dom-context-2d-globalCompositeOperation">globalCompositeOperation</code>, <code
    data-x="dom-context-2d-font">font</code>, <code
    data-x="dom-context-2d-textAlign">textAlign</code>, <code
    data-x="dom-context-2d-textBaseline">textBaseline</code>, <code
@@ -62583,7 +62583,7 @@ worker.postMessage(offscreenCanvas, [offscreenCanvas]);</code></pre>
   data-x="dom-context-2d-direction">direction</code> attribute must initially have the value "<code
   data-x="dom-context-2d-direction-inherit">inherit</code>".</p>
 
-  <p>Objects implement the <code>CanvasTextDrawingStyles</code> interface have attributes tha
+  <p>Objects that implement the <code>CanvasTextDrawingStyles</code> interface have attributes that
   control the spacing between letters and words. Such objects have associated <dfn
   data-x="concept-CanvasTextDrawingStyles-letter-spacing">letter spacing</dfn> and <dfn
   data-x="concept-CanvasTextDrawingStyles-word-spacing">word spacing</dfn> values, which are CSS