docs: misc, lsp

Problem:
This doc on `vim.lsp.completion.get()`:

    --- Used by the default LSP |omnicompletion| provider |vim.lsp.omnifunc()|, thus |i_CTRL-X_CTRL-O|
    --- invokes this in LSP-enabled buffers. Use CTRL-Y to select an item from the completion menu.
    --- |complete_CTRL-Y|

...makes two wrong claims:

1. "Used by the default LSP omnicompletion provider vim.lsp.omnifunc()"
    - `_omnifunc` does not call `M.get()`, it calls the internal `trigger()` directly.
2. "thus |i_CTRL-X_CTRL-O| invokes this in LSP-enabled buffers"
    - The two paths use different client sets:
        - `M.get()` reads `buf_handles[bufnr].clients` (clients
          explicitly registered via `vim.lsp.completion.enable(true, ...)`).
        - `_omnifunc` reads `lsp.get_clients({method='textDocument/completion'})` (every
          completion client, regardless of `enable()`).

Solution:
Update docs.

Co-authored-by: Koichi Shiraishi <zchee.io@gmail.com>
Co-authored-by: y9san9 / Alex Sokol <y9san9@gmail.com>
Co-authored-by: adv0r <>

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