Fix: (plz) Docstring, documentation

Author: alphapapa

README.org

@@ -125,7 +125,7 @@ Synchronously download a JPEG file, then create an Emacs image object from the d
    - ~string~ to pass the response body as a decoded string.
    - ~response~ to pass a ~plz-response~ structure.
    - ~file~ to pass a temporary filename to which the response body has been saved without decoding.
-   - ~(file ~FILENAME)~ to pass ~FILENAME~ after having saved the response body to it without decoding.  ~FILENAME~ must be a non-existent file; if it exists, it will not be overwritten, and an error will be signaled.
+   - ~(file ~FILENAME)~ to pass ~FILENAME~ after having saved the response body to it without decoding.  ~FILENAME~ must be a non-existent file; if it exists, it will not be overwritten, and an error will be signaled.  ~FILENAME~ is passed through ~expand-file-name~, which see.
    - A function, which is called in the response buffer with it narrowed to the response body (suitable for, e.g. ~json-read~).
 
    If ~DECODE~ is non-nil, the response body is decoded automatically.  For binary content, it should be nil.  When ~AS~ is ~binary~, ~DECODE~ is automatically set to nil.

plz.el

@@ -359,7 +359,8 @@ It may be:
 - `(file FILENAME)' to pass FILENAME after having saved the
   response body to it without decoding.  FILENAME must be a
   non-existent file; if it exists, it will not be overwritten,
-  and an error will be signaled.
+  and an error will be signaled.  FILENAME is passed through
+  `expand-file-name', which see.
 
 - A function, which is called in the response buffer with it
   narrowed to the response body (suitable for, e.g. `json-read').