Fix slate minor issues: spelling in function name, Mark instead of MarkJSON in LeafJSON (#30540)

* Fix function name getMarksBetweenOffset -> getMarksBetweenOffsets

Link to the source https://github.com/ianstormtaylor/slate/blob/a09c3c2fdfe87605988a13e968643f81b4936978/packages/slate/src/models/text.js#L348-L376

* LeafJSON should use MarkJSON instead of Mark

types/slate/index.d.ts

@@ -327,7 +327,7 @@ export class Text extends Immutable.Record({}) {
     getFirstText(): Text;
     getLastText(): Text;
     getText(): string;
-    getMarksBetweenOffset(
+    getMarksBetweenOffsets(
         startOffset: number,
         endOffset: number
     ): Immutable.Set<Mark>;
@@ -362,7 +362,7 @@ export interface LeafProperties {
 }
 
 export interface LeafJSON {
-    marks?: Mark[];
+    marks?: MarkJSON[];
     text?: string;
 }
 

types/slate/slate-tests.ts

@@ -13,7 +13,10 @@ const node: BlockJSON = {
 			leaves: [
 				{
 					text: "example",
-					marks: []
+					marks: [{
+                        data: { testData: "data"},
+                        type: "mark"
+                    }]
 				}
 			]
 		}