adjust syntax/loc and some docs

svn: r13899

collects/scheme/private/stxloc.ss

@@ -21,7 +21,8 @@
 	 (syntax (syntax-case** _ #f stxe kl free-identifier=? clause ...))])))
 
   (-define (relocate loc stx)
-    (if (syntax-source loc)
+    (if (or (syntax-source loc)
+            (syntax-position loc))
         (datum->syntax stx
                        (syntax-e stx)
                        loc

collects/scribblings/reference/filesystem.scrbl

@@ -423,7 +423,7 @@ absolute path; it is an absolute path when adding the
 platform-specific shared-library extension --- as produced by
 @scheme[(system-type 'so-suffix)] --- and then searching in the
 PLT-specific shared-object library directories (as determined by
-@scheme[find-dll-dirs]) locates the path. In this way, shared-object
+@scheme[get-lib-search-dirs]) locates the path. In this way, shared-object
 libraries that are installed specifically for PLT Scheme get carried
 along in distributions.
 

collects/scribblings/reference/stx-patterns.scrbl

@@ -348,7 +348,8 @@ for use only with a @scheme[quasisyntax] template.}
 Like @scheme[syntax], except that the immediate resulting syntax
 object takes its source-location information from the result of
 @scheme[stx-expr] (which must produce a syntax object), unless the
-@scheme[template] is just a pattern variable.}
+@scheme[template] is just a pattern variable or both the source and
+position of @scheme[stx-expr] are @scheme[#f].}
 
 
 @defform[(quasisyntax/loc stx-expr template)]{