fix: daria suggestion

Co-authored-by: Daria Pardue <[email protected]>

docs/upgrade-to-v5.md

@@ -322,7 +322,7 @@ export type JSONPrimitive = string | number | boolean | null;
 export type SerializableTypes = Document | Array<JSONPrimitive | Document> | JSONPrimitive;
 ```
 
-`SerializableTypes` is removed in v5 due to it inaccuracy and inconvenience when working with return type of `EJSON.parse()`.
+`SerializableTypes` is removed in v5 due to its inaccuracy and inconvenience when working with return type of `EJSON.parse()`.
 This type does not contain all possible outputs from this function and it cannot be conveniently related to a custom declared type.
 `EJSON.parse` and `EJSON.stringify` now accept `any` in alignment with `JSON`'s corresponding APIs.
 For users that desire type strictness it is recommended to wrap these APIs with type annotations that take/return `unknown` since that generally forces better narrowing logic than `SerializableTypes` would have prompted.