Incorrect source directory in build instructions and build scripts

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/14/install-windows-full.html
Description:

I recently downloaded the source for PG 14, and attempted to build for
windows using the instructions on this page:
https://www.postgresql.org/docs/current/install-windows-full.html

It appears that both the documentation _and_ the build scripts (e.g.
source/tools/msvc/build.pl) assume the root directory of the installation is
'src' when in fact it is 'source'. This prevents the build scripts from
working (and the documentation is wrong).