Makefile: Prevent doc recipe from creating dir named '$HOME'

Prior to this commit, running `make doc` had the unwanted side effect of
creating a directory literally named `$HOME` in the source tree.

Fixed rclone#8092

Author: dmcardle

Makefile

@@ -144,7 +144,7 @@ MANUAL.txt:	MANUAL.md
 	pandoc -s --from markdown-smart --to plain MANUAL.md -o MANUAL.txt
 
 commanddocs: rclone
-	XDG_CACHE_HOME="" XDG_CONFIG_HOME="" HOME="\$$HOME" USER="\$$USER" rclone gendocs docs/content/
+	XDG_CACHE_HOME="" XDG_CONFIG_HOME="" HOME="\$$HOME" USER="\$$USER" rclone gendocs --config=/notfound docs/content/
 
 backenddocs: rclone bin/make_backend_docs.py
 	XDG_CACHE_HOME="" XDG_CONFIG_HOME="" HOME="\$$HOME" USER="\$$USER" ./bin/make_backend_docs.py

bin/make_backend_docs.py

@@ -21,12 +21,12 @@ def find_backends():
 def output_docs(backend, out, cwd):
     """Output documentation for backend options to out"""
     out.flush()
-    subprocess.check_call(["./rclone", "help", "backend", backend], stdout=out)
+    subprocess.check_call(["./rclone", "--config=/notfound", "help", "backend", backend], stdout=out)
 
 def output_backend_tool_docs(backend, out, cwd):
     """Output documentation for backend tool to out"""
     out.flush()
-    subprocess.call(["./rclone", "backend", "help", backend], stdout=out, stderr=subprocess.DEVNULL)
+    subprocess.call(["./rclone", "--config=/notfound", "backend", "help", backend], stdout=out, stderr=subprocess.DEVNULL)
 
 def alter_doc(backend):
     """Alter the documentation for backend"""