pgsql: doc: Correct documentation of install-time environment variables

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pgsql: doc: Correct documentation of install-time environment variables

Peter Eisentraut-3
doc: Correct documentation of install-time environment variables

Since approximately PostgreSQL 10, it is no longer required that
environment variables at installation time such as PERL, PYTHON, TCLSH
be "full path names", so change that phrasing in the installation
instructions.  (The exact time of change appears to differ for PERL
and the others, but it works consistently in PostgreSQL 10.)

Also while we're here document the defaults for PERL and PYTHON, but
since the search list for TCLSH is so long, let's leave that out so we
don't need to maintain a copy of that list in the installation
instructions.

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/8b89a88618dff78dec25f08ee0ca83824b69b34b

Modified Files
--------------
doc/src/sgml/installation.sgml | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)