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Expand intro to Migration generator in Migrations Guide

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guides/source/active_record_migrations.md
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@ -126,7 +126,7 @@ generator to handle making it for you:
$ bin/rails generate migration AddPartNumberToProducts
```
This will create an empty but appropriately named migration:
This will create an appropriately named empty migration:
```ruby
class AddPartNumberToProducts < ActiveRecord::Migration[5.0]
@ -135,9 +135,14 @@ class AddPartNumberToProducts < ActiveRecord::Migration[5.0]
end
```
If the migration name is of the form "AddXXXToYYY" or "RemoveXXXFromYYY" and is
followed by a list of column names and types then a migration containing the
appropriate `add_column` and `remove_column` statements will be created.
This generator can do much more than append a timestamp to the file name.
Based on naming conventions and additional (optional) arguments it can
also start fleshing out the migration.
If the migration name is of the form "AddColumnToTable" or
"RemoveColumnFromTable" and is followed by a list of column names and
types then a migration containing the appropriate `add_column` and
`remove_column` statements will be created.
```bash
$ bin/rails generate migration AddPartNumberToProducts part_number:string