Update phone-authentication.mdx

Author: clairekinde11

src/content/docs/authenticate/authentication-methods/phone-authentication.mdx

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-You can allow users to use their phone number as a primary and secondary method for authentication. This is a passwordless method, where the user is sent a verification code via SMS. SMS can also be included as a secondary factor if you have [multi-factor authentication](/authenticate/multi-factor-auth/about-multi-factor-authentication/) set up. 
+You can allow users to use their phone as a primary method for authentication. This is a passwordless method, where the user is sent a verification code via SMS. SMS can also be included as a secondary factor if you have [multi-factor authentication](/authenticate/multi-factor-auth/about-multi-factor-authentication/) set up. 
 
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