Clearer help text for --reload

Immutable databases are not commonly used, but it's useful to clarify
that --reload will pick up on changes to metadata.

README.md

@@ -66,7 +66,7 @@ Now visiting http://localhost:8001/History/downloads will show you a web interfa
                                 allowed. Use 0.0.0.0 to listen to all IPs and
                                 allow access from other machines.
       -p, --port INTEGER        Port for server, defaults to 8001
-      --reload                  Automatically reload if database or code change
+      --reload                  Automatically reload if code or metadata change
                                 detected - useful for development
       --cors                    Enable CORS by serving Access-Control-Allow-
                                 Origin: *

datasette/cli.py

@@ -336,7 +336,7 @@ def uninstall(packages, yes):
 @click.option(
     "--reload",
     is_flag=True,
-    help="Automatically reload if database or code change detected - useful for development",
+    help="Automatically reload if code or metadata change detected - useful for development",
 )
 @click.option(
     "--cors", is_flag=True, help="Enable CORS by serving Access-Control-Allow-Origin: *"

docs/datasette-serve-help.txt

@@ -14,7 +14,7 @@ Options:
   -p, --port INTEGER RANGE  Port for server, defaults to 8001. Use -p 0 to automatically
                             assign an available port.
 
-  --reload                  Automatically reload if database or code change detected -
+  --reload                  Automatically reload if code or metadata change detected -
                             useful for development
 
   --cors                    Enable CORS by serving Access-Control-Allow-Origin: *