Update forms.md

[myverdict]

Added a key property to line 344 on the select option dynamic rendering.

Description of Problem

Missing key property when using a v-for directive in the dynamic rendering of a select with option.

Proposed Solution

Added a key property to line 344.

Additional Information

• Needs to be updated in the options API section as well.
• Playground code also needs to be updated by adding the key property in both the options API and Composition API.

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