vim-patch:7a734b7: tests: fix typo in comment (after v9.1.1511)

related: vim/vim#17660

https://github.com/vim/vim/commit/7a734b714895df25ba7ca9996fe0cd36460923a3

test/old/testdir/runtest.vim

@@ -164,7 +164,7 @@ endif
 
 
 " Prepare for calling test_garbagecollect_now().
-" Also avois some delays in Insert mode completion.
+" Also avoids some delays in Insert mode completion.
 let v:testing = 1
 
 let s:has_ffi = luaeval('pcall(require, "ffi")')