docs: Add PointEntry to API reference

docs/api/locations/README.md

@@ -9,4 +9,5 @@ type Location = Path | Point | Range
 - [Location](./location.md)
 - [Path](./path.md)
 - [Point](./point.md)
+- [PointEntry](./pointe-entry.md)
 - [Range](./range.md)

docs/api/locations/point-entry.md

@@ -0,0 +1,7 @@
+# PointEntry
+
+`PointEntry` objects are returned when iterating over `Point` objects that belong to a range.
+
+```typescript
+type PointEntry = [Point, 'anchor' | 'focus']
+```