Title case in headings: problem with "SSH"

**What got flagged?**
This is Neovim, using a code action, harper thinks SSH should be written Ssh

**Example of correct usage:**
It recognizes HTTP correctly, it should do the same for SSH

Start by reproducing the issue through Neovim's code action and trace the title-case rule that changes SSH to Ssh. Compare its handling with HTTP, then verify that SSH remains uppercase while the existing HTTP behavior is unchanged.

Written by the indexing model from the issue text.