[Backend] Update Broadcast

[jackfrost13]

Update existing broadcast. Authenticated API Requires API Testing. Refer #81 For API Testing resources.

This depends on #494 (Can be taken up once dependant issues are completed)

[PriyankjeetPradhan]

Can you assign this issue to me? (GSSOC'22 participant)

[saheelsapovadia]

If the issue still exists could you assign it to me ?, I'd like to work on it. 😃

[arinmodi]

@jackfrost13, can you assign this to me ?

[arinmodi]

@Kajol-Kumari, I have some questions

which fields are allowed to update ? should I append the imageUrl array into existing imageUrls or just replace it ? should I append the tags array into existing tags or just replace it ?

[arinmodi]

@Kajol-Kumari, I have some questions

which fields are allowed to update ? should I append the imageUrl array into existing imageUrls or just replace it ? should I append the tags array into existing tags or just replace it ?

@Kajol-Kumari, please give update ?

[Kajol-Kumari]

@Kajol-Kumari, I have some questions

which fields are allowed to update ? should I append the imageUrl array into existing imageUrls or just replace it ? should I append the tags array into existing tags or just replace it ?

@arinmodi we should replace the existing one with the new one

[arinmodi]

@Kajol-Kumari, I have made the PR #807