Update TextMetrics following spec discussion

Author: AndresRPerez12

spec/enhanced-textmetrics.md

@@ -61,7 +61,7 @@ The `getIndexFromOffset` method returns the strign indext for the character at t
 left to right (so negative offsets are valid). Values to the left or right of the text bounds will return 0 or
 `string.length` depending on the writing direction. The functionality is similar but not identical to [`document.caretPositionFromPoint`](https://developer.mozilla.org/en-US/docs/Web/API/Document/caretPositionFromPoint). In particular, there is no need to return the element containing the caret and offsets beyond the boundaries of the string are acceptable.
 
-`getTextClusters()` provides the ability to render minimal grapheme clusters (in conjunction with a new method for the canvas rendering context, more on that later). That is, for the character range given as in input, it returns the minimal rendering operations broken down as much as logically possible, with their corresponding positional data. The position is calculated with the original anchor point for the text as reference, while the `align` and `baseline` parameters in the options dictionary determine the desired alignment of each cluster. If no options dictionary is passed, these values are taken from the same as the ones used for the anchor point. If no range is passed, the whole text gets split into clusters.
+`getTextClusters()` provides the ability to render minimal grapheme clusters (in conjunction with a new method for the canvas rendering context, more on that later). That is, for the character range given as in input, it returns the minimal rendering operations broken down as much as logically possible, with their corresponding positional data. The position is calculated with the original anchor point for the text as reference, while the `align` and `baseline` parameters in the options dictionary determine the desired alignment of each cluster. If no options dictionary is passed, these values are the same as for the anchor point. If no range is passed, the whole text gets split into clusters.
 
 To actually render these clusters on the screen, two new methods for the rendering context is proposed: `fillTextCluster()` and `strokeTextCluster()`. They renders the cluster with the `align` and `baseline` stored in the object, ignoring the values set in the context. Additionally, to guarantee that the rendered cluster is accurate with the measured text, the rest of the `CanvasTextDrawingStyles` must be applied as they were when `ctx.measureText()` was called, regardless of any changes in these values on the context since. Note that to guarantee that the shaping of each cluster is indeed the same as it was when measured, it's necessary to use the whole string as context when rendering each cluster.