Grammar and Style Improvements in Documentation and Error Messages

[donatik27]

Changes Made

packages/helpers/src/dkim/index.ts

1. Comment correction:

   • Old: "Main modification are"
   • New: "Main modifications are"
     Reason: Fixed subject-verb agreement as "modifications" is plural.

2. Error message correction:

   • Old: "Multiple From header"
   • New: "Multiple From headers"
     Reason: Fixed plural form as the error refers to multiple headers.

packages/helpers/src/dkim/sanitizers.ts

1. Comment correction:

   • Old: "and put"
   • New: "and puts"
     Reason: Fixed subject-verb agreement with "Google" as the subject.

2. Preposition correction:

   • Old: "labels inserted to Subject"
   • New: "labels inserted in Subject"
     Reason: Used correct preposition for this context.