Use a more obviously gender neutral title

Author: ncoghlan

source/guides/creating-command-line-tools.rst

@@ -42,7 +42,7 @@ named after the main module:
     def greet(
         name: Annotated[str, typer.Argument(help="The (last, if --title is given) name of the person to greet")] = "",
         title: Annotated[str, typer.Option(help="The preferred title of the person to greet")] = "",
-        knight: Annotated[bool, typer.Option(help="Whether the person is a knight")] = False,
+        doctor: Annotated[bool, typer.Option(help="Whether the person is a doctor (MD or PhD)")] = False,
         count: Annotated[int, typer.Option(help="Number of times to greet the person")] = 1
     ):
         greeting = "Greetings, "
@@ -51,13 +51,10 @@ named after the main module:
                 name = title.lower().rstrip(".")
             else:
                 name = "friend"
-        if title or knight:
-            salutation = ""
-            if title:
-                salutation = title
-            elif knight:
-                salutation = "Sir "
-            greeting += salutation
+        if doctor and not title:
+            title = "Dr."
+        if title:
+            greeting += f"{title} "
         greeting += f"{name}!"
         for i in range(0, count):
             print(greeting)