docs: update more typing wordings

docs/developer.md

@@ -226,7 +226,7 @@ In `VolumePairList`, this implements different methods of sorting, does early va
 ##### sample
 
 ``` python
-    def filter_pairlist(self, pairlist: List[str], tickers: Dict) -> List[str]:
+    def filter_pairlist(self, pairlist: list[str], tickers: dict) -> List[str]:
         # Generate dynamic whitelist
         pairs = self._calculate_pairlist(pairlist, tickers)
         return pairs

docs/freqai-configuration.md

@@ -393,7 +393,7 @@ Here we create a `PyTorchMLPRegressor` class that implements the `fit` method. T
     
     For example, if you are using a binary classifier to predict price movements as up or down, you can set the class names as follows:
     ```python
-    def set_freqai_targets(self, dataframe: DataFrame, metadata: Dict, **kwargs) -> DataFrame:
+    def set_freqai_targets(self, dataframe: DataFrame, metadata: dict, **kwargs) -> DataFrame:
         self.freqai.class_names = ["down", "up"]
         dataframe['&s-up_or_down'] = np.where(dataframe["close"].shift(-100) >
                                                   dataframe["close"], 'up', 'down')

docs/strategy-callbacks.md

@@ -835,7 +835,7 @@ class DigDeeperStrategy(IStrategy):
                               current_entry_rate: float, current_exit_rate: float,
                               current_entry_profit: float, current_exit_profit: float,
                               **kwargs
-                              ) -> Union[float | None, tuple[float | None, str | None]]:
+                              ) -> float | None | tuple[float | None, str | None]:
         """
         Custom trade adjustment logic, returning the stake amount that a trade should be
         increased or decreased.

docs/strategy_migration.md

@@ -329,7 +329,7 @@ After:
 `order_time_in_force` attributes changed from `"buy"` to `"entry"` and `"sell"` to `"exit"`.
 
 ``` python
-    order_time_in_force: Dict = {
+    order_time_in_force: dict = {
         "buy": "gtc",
         "sell": "gtc",
     }
@@ -338,7 +338,7 @@ After:
 After:
 
 ``` python hl_lines="2 3"
-    order_time_in_force: Dict = {
+    order_time_in_force: dict = {
         "entry": "GTC",
         "exit": "GTC",
     }