Improve URLs.

git-svn-id: https://svn.r-project.org/R/trunk@88355 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: hornik

doc/manual/R-data.texi

@@ -1204,7 +1204,7 @@ Traditionally there had been large (and expensive) commercial @abbr{RDBMS}s
 (@uref{https://www.ibm.com/products/informix, Informix};
 @uref{https://www.oracle.com, Oracle}; 
 @I{Sybase};
-@uref{https://www.ibm.com/db2, IBM's DB2};
+@uref{https://www.ibm.com/products/db2, IBM's DB2};
 @uref{https://www.microsoft.com/sql-server/, Microsoft @acronym{SQL}
 Server} on Windows) and academic and small-system databases (such as
 MySQL@footnote{and forks, notably MariaDB.}, PostgreSQL, Microsoft

src/library/datasets/man/swiss.Rd

@@ -63,8 +63,10 @@
   Wadsworth & Brooks/Cole.
 }
 \note{
-  Files for all 182 districts in 1888 and other years have been available at
-  \url{https://oprdata.princeton.edu/archive/pefp/switz.aspx}.
+  Files for all 182 districts in 1888 and other years are available via
+  \url{https://opr.princeton.edu/princeton-european-fertility-project},
+  currently at
+  \url{https://opr.princeton.edu/switzerland-socio-economic-variables-1870-1930}.
 
   They state that variables \code{Examination} and \code{Education}
   are averages for 1887, 1888 and 1889.