Fix sphinx/build_docs warnings for ciphers (#12485)

* Fix sphinx/build_docs warnings for ciphers

* Fix

ciphers/simple_keyword_cypher.py

@@ -1,9 +1,11 @@
 def remove_duplicates(key: str) -> str:
     """
     Removes duplicate alphabetic characters in a keyword (letter is ignored after its
-        first appearance).
+    first appearance).
+
     :param key: Keyword to use
     :return: String with duplicates removed
+
     >>> remove_duplicates('Hello World!!')
     'Helo Wrd'
     """
@@ -18,6 +20,7 @@ def remove_duplicates(key: str) -> str:
 def create_cipher_map(key: str) -> dict[str, str]:
     """
     Returns a cipher map given a keyword.
+
     :param key: keyword to use
     :return: dictionary cipher map
     """
@@ -43,9 +46,11 @@ def create_cipher_map(key: str) -> dict[str, str]:
 def encipher(message: str, cipher_map: dict[str, str]) -> str:
     """
     Enciphers a message given a cipher map.
+
     :param message: Message to encipher
     :param cipher_map: Cipher map
     :return: enciphered string
+
     >>> encipher('Hello World!!', create_cipher_map('Goodbye!!'))
     'CYJJM VMQJB!!'
     """
@@ -55,9 +60,11 @@ def encipher(message: str, cipher_map: dict[str, str]) -> str:
 def decipher(message: str, cipher_map: dict[str, str]) -> str:
     """
     Deciphers a message given a cipher map
+
     :param message: Message to decipher
     :param cipher_map: Dictionary mapping to use
     :return: Deciphered string
+
     >>> cipher_map = create_cipher_map('Goodbye!!')
     >>> decipher(encipher('Hello World!!', cipher_map), cipher_map)
     'HELLO WORLD!!'
@@ -70,6 +77,7 @@ def decipher(message: str, cipher_map: dict[str, str]) -> str:
 def main() -> None:
     """
     Handles I/O
+
     :return: void
     """
     message = input("Enter message to encode or decode: ").strip()