fix outdated description for installing Vim on Linux #448

Job	Run time
Check unit tests and lints (ubuntu-latest)	32s
Vim v9.1.0626 (ubuntu-latest)	1m 8s
Neovim v0.4.4 (ubuntu-latest)	18s
Vim v9.1.0626 (macos-latest)	1m 5s
Stable and nightly (ubuntu-latest, stable, true)	21s
Neovim v0.4.4 (macos-latest)	16s
Vim v9.1.0626 (windows-latest)	1m 4s
Stable and nightly (ubuntu-latest, stable, false)	27s
Neovim v0.4.4 (windows-latest)	1m 17s
Stable and nightly (ubuntu-latest, nightly, true)	17s
Check unit tests and lints (macos-latest)	28s
Stable and nightly (ubuntu-latest, nightly, false)	1m 5s
Stable and nightly (macos-latest, stable, true)	28s
Stable and nightly (macos-latest, stable, false)	57s
Stable and nightly (macos-latest, nightly, true)	16s
Stable and nightly (macos-latest, nightly, false)	1m 3s
Stable and nightly (windows-latest, stable, true)	1m 28s
Stable and nightly (windows-latest, stable, false)	1m 37s
Stable and nightly (windows-latest, nightly, true)	1m 29s
Stable and nightly (windows-latest, nightly, false)	1m 5s
Stable and nightly (macos-12, stable, true)	44s
Stable and nightly (macos-12, stable, false)	1m 24s
Stable and nightly (macos-12, nightly, true)	29s
Stable and nightly (macos-12, nightly, false)	2m 9s
Stable and nightly (ubuntu-24.04, stable, true)	14s
Stable and nightly (ubuntu-24.04, stable, false)	29s
Stable and nightly (ubuntu-24.04, nightly, true)	31s
Stable and nightly (ubuntu-24.04, nightly, false)	1m 18s
	23m 59s

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