Add first line in doc for local-additions

[jpc-hpe]

Description

The documentation for vim help pages states that a first line is required for the file to appear under :help local-additions, with the following format: *tag* description

This change adds such line

There was no issue created for this, but I can create one if required

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

After applying the change, a new entry appears under :help local-additions (or at the end of the main :helppage)

• Test A: enter :help local-additions and verify that a new telescope.txt entry is present

Configuration:

• Neovim version (nvim --version): NVIM v0.11.3a (with LazyVim)
• Operating system and version: Debian 12.11 (running under WSL)

Checklist:

• My code follows the style guidelines of this project (stylua)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (lua annotations)

Notes:

When modifiying directly on my running system, I had to run manually helptags ++t $HOME/.local/share/nvim/lazy/telescope.nvim/doc before a double click on the new entry was effective. But since the github repository does not contain any tags file, I assume that tags generation happens automatically with plugin installation