Update documentation to refer to Git rather than Subversion.

README

@@ -3,7 +3,7 @@ and Unix Telnet and SSH client.
 
 If you want to rebuild PuTTY from source, we provide a variety of
 Makefiles and equivalents. (If you have fetched the source from
-Subversion, you'll have to generate the Makefiles yourself -- see
+Git, you'll have to generate the Makefiles yourself -- see
 below.)
 
 There are various compile-time directives that you can use to
@@ -103,7 +103,7 @@ For building on Unix:
 
  - The Unix Makefiles have an `install' target. Note that by default
    it tries to install `man' pages; if you have fetched the source via
-   Subversion then you will need to have built these using Halibut
+   Git then you will need to have built these using Halibut
    first - see below.
 
  - It's also possible to build the Windows version of PuTTY to run
@@ -119,7 +119,7 @@ corrections to the actual Makefiles, Makefile.am or Makefile.in.
 
 The Unix `configure' script and its various requirements are generated
 by the shell script `mkauto.sh', which requires GNU Autoconf, GNU
-Automake, and Gtk; if you've got the source from Subversion rather
+Automake, and Gtk; if you've got the source from Git rather
 than using one of our source snapshots, you'll need to run this
 yourself. The input file to Automake is generated by mkfiles.pl along
 with all the rest of the makefiles, so you will need to run mkfiles.pl

doc/faq.but

@@ -1187,7 +1187,7 @@ Partly, because we don't want to move the web site location (see
 Also, security reasons. PuTTY is a security product, and as such it
 is particularly important to guard the code and the web site against
 unauthorised modifications which might introduce subtle security
-flaws. Therefore, we prefer that the Subversion repository, web site and
+flaws. Therefore, we prefer that the Git repository, web site and
 FTP site remain where they are, under the direct control of system
 administrators we know and trust personally, rather than being run
 by a large organisation full of people we've never met and which is

doc/pgpkeys.but

@@ -71,7 +71,7 @@ human intervention, so nobody would be able to type a passphrase.
 
 The actual snapshots are built on a team member's home Windows box.
 The keys themselves are stored on an independently run Unix box
-(the same one that hosts our Subversion repository). After
+(the same one that hosts our Git repository). After
 being built, the binaries are uploaded to this Unix box and then
 signed automatically.