Canonicalize some URLs

HISTORY

 Release notes for all versions of PostgreSQL can be found on-line at
-https://www.postgresql.org/docs/current/static/release.html
+https://www.postgresql.org/docs/current/release.html
 
 Distribution file sets include release notes for their version and preceding
 versions.  Visit the file doc/src/sgml/html/release.html in an HTML browser.

README

@@ -11,7 +11,7 @@ and functions.  This distribution also contains C language bindings.
 
 PostgreSQL has many language interfaces, many of which are listed here:
 
-	https://www.postgresql.org/download
+	https://www.postgresql.org/download/
 
 See the file INSTALL for instructions on how to build and install
 PostgreSQL.  That file also lists supported operating systems and

README.git

@@ -6,7 +6,7 @@ git and so will not be present if you are using a git checkout.
 
 If you are using a git checkout, you can view the most recent installation
 instructions at:
-	https://www.postgresql.org/docs/devel/static/installation.html
+	https://www.postgresql.org/docs/devel/installation.html
 
 Users compiling from git will also need compatible versions of Bison, Flex,
 and Perl, as discussed in the install documentation.  These programs are not

src/bin/psql/copy.c

@@ -628,7 +628,7 @@ handleCopyIn(PGconn *conn, FILE *copystream, bool isbinary, PGresult **res)
 					/*
 					 * This code erroneously assumes '\.' on a line alone
 					 * inside a quoted CSV string terminates the \copy.
-					 * http://www.postgresql.org/message-id/E1TdNVQ-0001ju-GO@wrigleys.postgresql.org
+					 * https://www.postgresql.org/message-id/E1TdNVQ-0001ju-GO@wrigleys.postgresql.org
 					 */
 					if (strcmp(buf, "\\.\n") == 0 ||
 						strcmp(buf, "\\.\r\n") == 0)