[LSP] README: update vim editor configuration options #4028

Job	Run time
KytheXrefs	0s
ClangTidy	2m 56s
KytheVerification	13m 15s
x86_64 test	3m 55s
arm64 test	4m 20s
x86_64 test-nortti	3m 35s
x86_64 test-c++20	3m 48s
x86_64 test-c++23	4m 0s
x86_64 smoke-test	10m 0s
arm64 smoke-test	10m 28s
x86_64 smoke-test-analyzer	14m 0s
arm64 smoke-test-analyzer	15m 0s
x86_64 asan	5m 32s
x86_64 asan-clang	4m 47s
x86_64 compile	2m 58s
arm64 compile	3m 34s
x86_64 compile-clang	3m 2s
arm64 compile-clang	3m 40s
x86_64 compile-static	2m 44s
arm64 compile-static	3m 45s
x86_64 compile-static-clang	3m 13s
arm64 compile-static-clang	3m 37s
x86_64 coverage	17m 25s
x86_64 clean	7m 6s
arm64 clean	6m 38s
MacOsBuild	7m 32s
Generate Build matrix	4s
MacOsBuildDevTools	6m 28s
PrepareVSPlugin	2m 23s
VerifyFormatting	1m 31s
WindowsBuild	10m 7s
Build ·${{ matrix.arch }}:${{ matrix.os }}:${{ matrix.ver }}${{ (((matrix.link == 'static') && ':static') \|\| '') }}	0s
Build and deploy GitHub pages	10s
📦 Release	0s
	3h 1m 33s

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