Try to improve the rustfmt.overrideCommand docs

crates/rust-analyzer/src/config.rs

@@ -456,7 +456,10 @@ config_data! {
         /// Additional arguments to `rustfmt`.
         rustfmt_extraArgs: Vec<String>               = "[]",
         /// Advanced option, fully override the command rust-analyzer uses for
-        /// formatting.
+        /// formatting. This should be the equivalent of `rustfmt` here, and
+        /// not that of `cargo fmt`. The file contents will be passed on the
+        /// standard input and the formatted result will be read from the
+        /// standard output.
         rustfmt_overrideCommand: Option<Vec<String>> = "null",
         /// Enables the use of rustfmt's unstable range formatting command for the
         /// `textDocument/rangeFormatting` request. The rustfmt option is unstable and only

docs/user/generated_config.adoc

@@ -699,7 +699,10 @@ Additional arguments to `rustfmt`.
 +
 --
 Advanced option, fully override the command rust-analyzer uses for
-formatting.
+formatting. This should be the equivalent of `rustfmt` here, and
+not that of `cargo fmt`. The file contents will be passed on the
+standard input and the formatted result will be read from the
+standard output.
 --
 [[rust-analyzer.rustfmt.rangeFormatting.enable]]rust-analyzer.rustfmt.rangeFormatting.enable (default: `false`)::
 +

editors/code/package.json

@@ -1283,7 +1283,7 @@
                     }
                 },
                 "rust-analyzer.rustfmt.overrideCommand": {
-                    "markdownDescription": "Advanced option, fully override the command rust-analyzer uses for\nformatting.",
+                    "markdownDescription": "Advanced option, fully override the command rust-analyzer uses for\nformatting. This should be the equivalent of `rustfmt` here, and\nnot that of `cargo fmt`. The file contents will be passed on the\nstandard input and the formatted result will be read from the\nstandard output.",
                     "default": null,
                     "type": [
                         "null",