Update rust.lua (#935)

ftplugin/rust.lua

@@ -95,7 +95,7 @@ else
     cmd = { DATA_PATH .. "/lspinstall/rust/rust-analyzer" },
     on_attach = require("lsp").common_on_attach,
     filetypes = { "rust" },
-    root_dir = require("lspconfig.util").root_pattern("Carrust.toml", "rust-project.json"),
+    root_dir = require("lspconfig.util").root_pattern("Cargo.toml", "rust-project.json"),
   }
 end