bug#67669: 29.1; Drop text suggesting using `and' to replace `if'

[Drew Adams]

> Well if we use `if' with else then yes.  

Even if we use it with THEN.

`if' and `cond' are completely general and
don't, by themselves abstractly, suggest
any particular connotation for a human
reader.  They can return any value you like.
Whether the value returned is used anywhere
is neither determined nor suggested by any
convention.