Chap9: Changed hbi to bi, removed mentiond of using "h".  With "h" in "hbi", I ...

...dont see single character "words" get properly surrounded by double quotes.

For example, file content is (newlines are immediately after "1" and "2")

constant_var_a = 1
constant_var_b = 2

With hbi
Positioning cursor on 1, and typing ", I end up with
constant_var_1 "= 1"
constant_var_2 = 2

With bi
Positioning cursor on 1, and typing ", I end up with
constant_var_1 = "1"
constant_var_2 = 2