Extend deprecation message

Author: amureki

model_bakery/random_gen.py

@@ -135,7 +135,11 @@ def gen_slug(max_length: int) -> str:
 
 def gen_text() -> str:
     warnings.warn(
-        "gen_text is deprecated, use gen_string instead",
+        "\n"
+        "Accessing `model_bakery.random_gen.gen_text` is deprecated "
+        "and will be removed in a future major release. Please use "
+        "`model_bakery.random_gen.gen_string` instead."
+        "\n",
         DeprecationWarning,
         stacklevel=2,
     )