text: Title: DOC grammar issue in the governance page
  Body: ### Describe the issue linked to the documentation
  
  In the governance page at line: https://github.com/scikit-learn/scikit-learn/blob/59dd128d4d26fff2ff197b8c1e801647a22e0158/doc/governance.rst?plain=1#L161
  
  there is a reference attached to "Enhancement proposals (SLEPs)." 
  However, after compiling, it is displayed as "a Enhancement proposals (SLEPs)" which is grammatically incorrect.
  Page at: https://scikit-learn.org/stable/governance.html
  
  ### Suggest a potential alternative/fix
  
  Fix it by updating the line with 
  ```
  an :ref:`slep`
  ```