title: How to rename a specific cell in R?
body: <p>I just want to change the "District of Columbia" to "D.C."</p>
  
  <p><img src="https://i.stack.imgur.com/tetZM.jpg" alt="fig"></p>
  
  <p><img src="https://i.stack.imgur.com/Hi7Kn.jpg" alt="enter image description here"></p>