Keep references to old file paths in documentation

doc/invoke.txt

@@ -92,17 +92,18 @@ Yash initializes itself as follows:
     specified or the shell is in the link:posix.html[POSIXly-correct mode].
     +
     If the +--profile={{filename}}+ option is not specified, the shell reads
-    link:expand.html#tilde[~]/.config/yash/profile as a default.
+    $XDG_CONFIG_HOME/yash/profile or link:expand.html#tilde[~]/.yash_profile
+    as a fallback.
  .. If in the interactive mode, the shell reads the file specified by the
     +--rcfile={{filename}}+ option unless the +--norcfile+ option is specified.
     +
     If the +--rcfile={{filename}}+ option is not specified, the shell instead
     reads the following files:
     - If not in the POSIXly-correct mode, the shell reads
-      link:expand.html#tilde[~]/.config/yash/rc or
-      link:expand.html#tilde[~]/.yashrc. If it cannot be read, the shell
-      searches link:params.html#sv-yash_loadpath[+YASH_LOADPATH+] for a file
-      named initialization/default.
+      $XDG_CONFIG_HOME/yash/rc or link:expand.html#tilde[~]/.yashrc as a
+      fallback. If it cannot be read, the shell searches
+      link:params.html#sv-yash_loadpath[+YASH_LOADPATH+] for a file named
+      initialization/default.
     - If in the POSIXly-correct mode, the shell performs
       link:expand.html[parameter expansion] on the value of the
       link:params.html#sv-env[+ENV+ environment variable] and treats the