docs: Organize the Range docs into sections by type

docs/api/range.md

@@ -12,6 +12,14 @@ interface Range {
 
 ## Static methods
 
+- [Relationship methods](#relationship-methods)
+- [Check methods](#check-methods)
+- [Transform method](#transform-method)
+
+### Relationship methods
+
+Relationship of a Range like its start and end points and the intersection with another Range.
+
 ###### `Range.edges(range: Range, options?): [Point, Point]`
 
 Get the start and end points of a `range`, in the order in which they appear in the document.
@@ -22,6 +30,22 @@ Options: `{reverse?: boolean}`
 
 Get the end point of a `range`.
 
+###### `Range.intersection(range: Range, another: Range): Range | null`
+
+Get the intersection of one `range` with `another`.
+
+###### `Range.points(range: Range): Generator<PointEntry>`
+
+Iterate through all the point entries in a `range`.
+
+###### `Range.start(range: Range): Point`
+
+Get the start point of a `range`
+
+### Check methods
+
+Check some attribute of a Range. Always returns a boolean.
+
 ###### `Range.equals(range: Range, another: Range): boolean`
 
 Check if a `range` is exactly equal to `another`.
@@ -30,10 +54,6 @@ Check if a `range` is exactly equal to `another`.
 
 Check if a `range` includes a path, a point, or part of another range.
 
-###### `Range.intersection(range: Range, another: Range): Range | null`
-
-Get the intersection of one `range` with `another`.
-
 ###### `Range.isBackward(range: Range): boolean`
 
 Check if a `range` is backward, meaning that its anchor point appears _after_ its focus point in the document.
@@ -54,13 +74,7 @@ Check if a `range` is forward. This is the opposite of `Range.isBackward` and is
 
 Check if a `value` implements the `Range` interface.
 
-###### `Range.points(range: Range): Generator<PointEntry>`
-
-Iterate through all the point entries in a `range`.
-
-###### `Range.start(range: Range): Point`
-
-Get the start point of a `range`
+### Transform methods
 
 ###### `Range.transform(range: Range, op: Operation, options): Range | null`