Added and corrected documentation for the 'shared' option

Configure

@@ -27,8 +27,7 @@ my $usage="Usage: Configure [no-<cipher> ...] [-Dxxx] [-lxxx] [-Lxxx] [-fxxx] [-
 # [no-]threads  [don't] try to create a library that is suitable for
 #               multithreaded applications (default is "threads" if we
 #               know how to do it)
-# [no-]shared	[don't] try to create shared libraries instead of static
-#		ones when possible.
+# [no-]shared	[don't] try to create shared libraries when supported.
 # no-asm        do not use assembler
 # no-dso        do not compile in any native shared-library methods. This
 #               will ensure that all methods just return NULL.

INSTALL

@@ -53,6 +53,12 @@
                 This will usually require additional system-dependent options!
                 See "Note on multi-threading" below.
 
+  no-shared     Don't try to create shared libraries.
+
+  shared        In addition to the usual static libraries, create shared
+                libraries on platforms where it's supported.  See "Note on
+                shared libraries" below.
+
   no-asm        Do not use assembler code.
 
   386           Use the 80386 instruction set only (the default x86 code is
@@ -253,3 +259,14 @@
  you can still use "no-threads" to suppress an annoying warning message
  from the Configure script.)
 
+
+ Note on shared libraries
+ ------------------------
+
+ For some systems, the OpenSSL Configure script knows what is needed to
+ build shared libraries for libcrypto and libssl.  On these systems,
+ the shared libraries are currently not created by default, but giving
+ the option "shared" will get them created.  This method supports Makefile
+ targets for shared library creation, like linux-shared.  Those targets
+ can currently be used on their own just as well, but this is expected
+ to change in future versions of OpenSSL.