Rename nix doctor to nix config check

Fix #7672

doc/manual/src/contributing/cli-guideline.md

@@ -87,7 +87,7 @@ impacted the most by bad user experience.
       and [aligning of text](#text-alignment).
     - [Autocomplete](#shell-completion) of options.
 
-  Examples of such commands: `nix doctor`, `nix edit`, `nix eval`, ...
+  Examples of such commands: `nix edit`, `nix eval`, ...
 
 - **Utility and scripting commands**
 

src/nix/config-check.cc

@@ -38,7 +38,7 @@ void checkInfo(const std::string & msg) {
 
 }
 
-struct CmdDoctor : StoreCommand
+struct CmdConfigCheck : StoreCommand
 {
     bool success = true;
 
@@ -152,4 +152,4 @@ struct CmdDoctor : StoreCommand
     }
 };
 
-static auto rCmdDoctor = registerCommand<CmdDoctor>("doctor");
+static auto rCmdConfigCheck = registerCommand2<CmdConfigCheck>({ "config", "check" });

src/nix/main.cc

@@ -139,6 +139,7 @@ struct NixArgs : virtual MultiCommand, virtual MixCommonArgs, virtual RootArgs
         {"to-base32", {"hash", "to-base32"}},
         {"to-base64", {"hash", "to-base64"}},
         {"verify", {"store", "verify"}},
+        {"doctor", {"config", "check"}},
     };
 
     bool aliasUsed = false;