update entity-alias doc fix

[maxiscoding28]

The name, canonical_id, and mount_accessor parameters are not required parameters for updating a entity-alias.

Example:

~ vault status -format=json | jq -r '.version'
1.12.2+ent

~ vault read -field=mount_accessor identity/entity-alias/id/$AID 
auth_userpass_29867988

~ vault write identity/entity-alias/id/$AID mount_accessor=$MA2
Key             Value
---             -----
canonical_id    fd098313-4019-c7f1-de82-7fce975bf096
id              b19fe0ef-2aa6-6a44-c103-0d5c92a234cc

~ vault read -field=mount_accessor identity/entity-alias/id/$AID 
auth_userpass_be3e3761

[yhyakuna]

Thanks