Update validator function name in examples to show that value must b… (#3327)

* Update validator function name in  examples to show that value must be bar vs must contain a space

* Add md file in

changes/3327-michaelrios28.md

@@ -0,0 +1 @@
+Changed the validator method name in the [Custom Errors example](https://pydantic-docs.helpmanual.io/usage/models/#custom-errors) to more accurately describe what the validator is doing; changed from `name_must_contain_space` to ` value_must_equal_bar`.

docs/examples/models_errors2.py

@@ -5,7 +5,7 @@ class Model(BaseModel):
     foo: str
 
     @validator('foo')
-    def name_must_contain_space(cls, v):
+    def value_must_equal_bar(cls, v):
         if v != 'bar':
             raise ValueError('value must be "bar"')
 

docs/examples/models_errors3.py

@@ -10,7 +10,7 @@ class Model(BaseModel):
     foo: str
 
     @validator('foo')
-    def name_must_contain_space(cls, v):
+    def value_must_equal_bar(cls, v):
         if v != 'bar':
             raise NotABarError(wrong_value=v)
         return v