Fix a small typo in config.example.lua (#1473)

utils/installer/config.example.lua

@@ -41,10 +41,10 @@ lvim.keys.normal_mode["<C-s>"] = ":w<cr>"
 --   name = "+Trouble",
 --   r = { "<cmd>Trouble lsp_references<cr>", "References" },
 --   f = { "<cmd>Trouble lsp_definitions<cr>", "Definitions" },
---   d = { "<cmd>Trouble lsp_document_diagnostics<cr>", "Diagnosticss" },
+--   d = { "<cmd>Trouble lsp_document_diagnostics<cr>", "Diagnostics" },
 --   q = { "<cmd>Trouble quickfix<cr>", "QuickFix" },
 --   l = { "<cmd>Trouble loclist<cr>", "LocationList" },
---   w = { "<cmd>Trouble lsp_workspace_diagnostics<cr>", "Diagnosticss" },
+--   w = { "<cmd>Trouble lsp_workspace_diagnostics<cr>", "Diagnostics" },
 -- }
 
 -- TODO: User Config for predefined plugins