Rework installation instructions again

Dept. of second thoughts: the new verbiage added in commit aaec237b1a2f
is targeted at the wrong audience.  Remove the bits about git and talk
about how to get tarballs only.  People looking for the git repo can
look in the appendix.  That'll need to be expanded, but this commit
doesn't do that.

In passing, fix a couple of typos that snuck in with the previous
commit.

Discussion: https://postgr.es/m/713760.1626891263@sss.pgh.pa.us

diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index fddd7d3905116141b6a910ba9e48729cd862cd75..1ebe8482bfc3f27c25830b52a567214894138ca5 100644 (file)
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -354,29 +354,13 @@ su - postgres
   Getting the Source
 
   
-   The version control repository for PostgreSQL
-   can be obtained from
-   ;
-   this is the recommended way to obtain the
-   PostgreSQL source code.
-   You can obtain a clone of the repository by running
-
-git clone https://git.postgresql.org/git/postgresql.git
-
-   This will create a directory postgresql under the current
-   directory with the PostgreSQL sources.
-   Change into that directory for the rest of the installation procedure.
-   See  for further information.
-  
-
-  
-   Alternatively, source code for the released versions can be obtained
-   from the download section of our website:
+   The PostgreSQL source code for released versions
+   can be obtained from the download section of our website:
    .
-   Download then
+   Download the
    postgresql-version.tar.gz
    or postgresql-version.tar.bz2
-   you're interested in, then unpack it:
+   file you're interested in, then unpack it:
 
 tar xf postgresql-version.tar.bz2
 
@@ -385,6 +369,11 @@ su - postgres
    the current directory with the PostgreSQL sources.
    Change into that directory for the rest of the installation procedure.
   
+
+  
+   Alternatively, you can use the Git version control system; see
+    for more information.
+