Two heading typos

[jMarcS]

In the middle of page 98 (v01.70 edition) this appears:

Traditional italics can be best imitated with n = -0.25gr.text.underline Boolean

The sentence should end at the "-0.25". The "gr.text.underline Boolean" should be a heading just like "gr.text.skew n" before and "gr.text.strike Boolean" after.

In the middle of page 100, this heading appears:

gr.bitmap.draw Object_ptr, bitmap_ptr, x , w

The "w" at the end should be a "y".