WSCL Issue: READ-DELIMITING-WHITESPACE-INCONSISTENCY

[Thuna-Cing]

The second instance of READ in the third paragraph of its description appears to be a typo for READ-PRESERVING-WHITESPACE. This proposal fixes this.

Some more implementations would be nice in the Current practice section, I only have ABCL, ECL, and SBCL at hand right now.