rule set standard library typo fix (#2824)

* rule set standard library typo fix

* back compat and change log

* pr feedback. made correct spelling the actual class not the alias and update changelog.

* double ticks

.changes/next-release/bugfix-EndpointProviderStandardLibrary-21046.json

@@ -0,0 +1,5 @@
+{
+  "type": "enhancement",
+  "category": "Endpoint Provider Standard Library",
+  "description": "Correct spelling of 'library' in ``StandardLibrary`` class"
+}

botocore/endpoint_provider.py

@@ -52,7 +52,7 @@
 STRING_FORMATTER = Formatter()
 
 
-class RuleSetStandardLibary:
+class RuleSetStandardLibrary:
     """Rule actions to be performed by the EndpointProvider."""
 
     def __init__(self, partitions_data):
@@ -408,6 +408,11 @@ def aws_is_virtual_hostable_s3_bucket(self, value, allow_subdomains):
         return self.is_valid_host_label(value, allow_subdomains=False)
 
 
+# maintains backwards compatibility as `Library` was misspelled
+# in earlier versions
+RuleSetStandardLibary = RuleSetStandardLibrary
+
+
 class BaseRule:
     """Base interface for individual endpoint rules."""
 
@@ -657,7 +662,7 @@ def __init__(
         self.version = version
         self.parameters = self._ingest_parameter_spec(parameters)
         self.rules = [RuleCreator.create(**rule) for rule in rules]
-        self.rule_lib = RuleSetStandardLibary(partitions)
+        self.rule_lib = RuleSetStandardLibrary(partitions)
         self.documentation = documentation
 
     def _ingest_parameter_spec(self, parameters):

tests/unit/test_endpoint_provider.py

@@ -24,7 +24,7 @@
     ErrorRule,
     RuleCreator,
     RuleSet,
-    RuleSetStandardLibary,
+    RuleSetStandardLibrary,
     TreeRule,
 )
 from botocore.exceptions import (
@@ -95,7 +95,7 @@ def partitions(loader):
 
 @pytest.fixture(scope="module")
 def rule_lib(partitions):
-    return RuleSetStandardLibary(partitions)
+    return RuleSetStandardLibrary(partitions)
 
 
 @pytest.fixture(scope="module")