Remove mentions of filepaths that are incorrect for the debian package of
Mercury.

--- a/README
+++ b/README
@@ -21,8 +21,6 @@
 	README.Solaris		Solaris (SunOS) on SPARC or Intel x86.
 
 The documentation sources are in the `doc' subdirectory.
-The installation process will install INFO, HTML, and DVI versions under the
-nominated installation prefix, by default /usr/local/mercury-22.01.8.
 It will also install Unix-style man pages under the same prefix.
 
 The files RELEASE_NOTES, NEWS, HISTORY, LIMITATIONS, and BUGS
