[fpc-pascal] Trim(): incompatibility with Delphi

[Bernd]

The documentation is incorrect. It says:

"Description

Trim strips blank characters (spaces) at the beginning and end of S
and returns the resulting string. Only #32 characters are stripped. "

But it will strip everything <= #32, not only #32 as the documentation
suggests. The same error is in the docs for TrimLeft() and TrimRight()