the email format restriction in the UG does not align with the actual app

[ki1r0]

##Description
the email format restriction in the UG does not align with the actual app

##Steps to reproduce
edit client 1 -e john@gmail

##Expected
throw an error message of invalid email address as this is clearly forbiddened in the UG

##Actual
Successfully edited
Edited Client: Luke; Phone: 88776655; Email: john@gmail; Address: 5 Punggol Street; Tags:

##Screenshots

[soc-se-bot]

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