update documentation in pymongocrypt bindings

bindings/python/pymongocrypt/binding.py

@@ -654,6 +654,7 @@ def _parse_version(version):
 /// String constant for setopt_algorithm "Indexed" explicit encryption
 /// String constant for setopt_algorithm "Unindexed" explicit encryption
 /// String constant for setopt_algorithm "Range" explicit encryption
+/// NOTE: "Range" is currently unstable API and subject to backwards breaking changes.
 
 /**
  * Identify the AWS KMS master key to use for creating a data key.
@@ -836,6 +837,7 @@ def _parse_version(version):
  * Explicit helper method to encrypt a Match Expression or Aggregate Expression.
  * Contexts created for explicit encryption will not go through mongocryptd.
  * Requires query_type to be "range".
+ * NOTE: "Range" is currently unstable API and subject to backwards breaking changes.
  *
  * This method expects the passed-in BSON to be of the form:
  * { "v" : FLE2RangeFindDriverSpec }
@@ -1373,6 +1375,7 @@ def _parse_version(version):
 
 /**
  * Set options for explicit encryption with the "range" algorithm.
+ * NOTE: "range" is currently unstable API and subject to backwards breaking changes.
  *
  * @p opts is a BSON document of the form:
  * {