Improve URLs.

git-svn-id: https://svn.r-project.org/R/trunk@87456 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: hornik

doc/manual/R-admin.texi

@@ -5579,7 +5579,8 @@ Mac users.  Earlier versions of macOS came with an Aqua Tcl/Tk
 distribution but these were often not at all recent versions of Tcl/Tk.
 It is better to install Tcl/Tk 8.6.x from the sources@footnote{Configure
 Tk with @option{--enable-aqua}.} or a binary distribution from
-@uref{https://www.activestate.com/products/tcl/}.  For the latter,
+@uref{https://www.activestate.com/platform/supported-languages/tcl/}.
+For the latter,
 configure @R{} with
 @example
 --with-tcl-config=/Library/Frameworks/Tcl.framework/tclConfig.sh 

doc/manual/R-data.texi

@@ -1219,7 +1219,7 @@ There are other commonly used data sources, including spreadsheets,
 non-relational databases and even text files (possibly compressed).
 Open Database Connectivity (@abbr{ODBC}) is a standard to use all of
 these data sources.  It originated on Windows (see
-@uref{https://docs.microsoft.com/en-us/sql/odbc/microsoft-open-database-connectivity-odbc})
+@uref{https://learn.microsoft.com/en-us/sql/odbc/microsoft-open-database-connectivity-odbc})
 but is also implemented on Linux/Unix/macOS.
 
 All of the packages described later in this chapter provide clients to

doc/manual/R-exts.texi

@@ -8999,7 +8999,7 @@ be current.
 Options include using @command{sprof} for a shared object, and
 @command{oprofile} (see @uref{https://oprofile.sourceforge.io/news/})
 and @command{perf} (see
-@uref{https://perf.wiki.kernel.org/index.php/Tutorial}) for any
+@uref{https://perfwiki.github.io/}) for any
 executable or shared object.  These seem less widely supplied than they
 used to be.  There is also `Google Performance Tools', also known as
 @pkg{gperftools} or @pkg{google-perftools}.

src/library/base/man/Memory-limits.Rd

@@ -69,9 +69,9 @@ limit vmemoryuse 4096m
 \section{Windows}{
   The address-space limit is 2\abbr{Gb} under 32-bit Windows unless the OS's
   default has been changed to allow more (up to 3\abbr{Gb}).  See
-  \url{https://docs.microsoft.com/en-gb/windows/desktop/Memory/physical-address-extension}
+  \url{https://learn.microsoft.com/en-gb/windows/desktop/Memory/physical-address-extension}
   and
-  \url{https://docs.microsoft.com/en-gb/windows/desktop/Memory/4-gigabyte-tuning}.
+  \url{https://learn.microsoft.com/en-gb/windows/desktop/Memory/4-gigabyte-tuning}.
   Under most 64-bit versions of Windows the limit for a 32-bit build
   of \R is 4\abbr{Gb}: for the oldest ones it is 2\abbr{Gb}.  The limit for a 64-bit
   build of \R (imposed by the OS) is 8Tb.

src/library/base/man/Random.Rd

@@ -317,7 +317,7 @@ set.seed(seed, kind = NULL, normal.kind = NULL, sample.kind = NULL)
   \emph{ACM Transactions on Modeling and Computer Simulation},
   \bold{8}, 3--30.\cr
   Source code formerly at \code{http://www.math.keio.ac.jp/~matumoto/emt.html}.\cr
-  Now see \url{http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/VERSIONS/C-LANG/c-lang.html}.
+  Now see \url{https://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/VERSIONS/C-LANG/c-lang.html}.
 
   Reeds, J., Hubert, S. and Abrahams, M. (1982--4).
   C implementation of SuperDuper, University of California at Berkeley.

src/library/utils/man/clipboard.Rd

@@ -29,7 +29,7 @@ writeClipboard(str, format = 13)
 }
 \details{
   The Windows clipboard offers data in a number of formats: see
-  e.g.\sspace{}\url{https://docs.microsoft.com/en-gb/windows/desktop/dataxchg/clipboard-formats}.
+  e.g.\sspace{}\url{https://learn.microsoft.com/en-gb/windows/desktop/dataxchg/clipboard-formats}.
 
   The standard formats include
   \tabular{lrl}{