doc fixes (#35435)

apps/docs/content/guides/local-development/declarative-database-schemas.mdx

@@ -73,8 +73,8 @@ supabase db diff -f create_employees_table
 <StepHikeCompact>
 
   <StepHikeCompact.Step step={3}>
-    <StepHikeCompact.Details title="Start the local database">
-      The new migration file will be used when starting the database locally so you can validate your schema using the local Dashboard.
+    <StepHikeCompact.Details title="Start the local database and apply migrations">
+      Start the local database and then apply the migration file to see your schema changes in the local Dashboard.
     </StepHikeCompact.Details>
 
     <StepHikeCompact.Code>
@@ -82,7 +82,7 @@ supabase db diff -f create_employees_table
 <$CodeTabs>
 
 ```bash name=Terminal
-supabase start
+supabase start && supabase migration up
 ```
 
 </$CodeTabs>