Although altering Tcl.n is fraught with danger, nevertheless the following three improvements seem
appropriate:

1. Modify rule 1 to clarify the two phases of Tcl execution.

2. Modify rule 7 to clarify the ${} syntax and how it interacts with array variables.

3. Change the quotation marks to the neutral double quote character (").  This is consistent with
Tcl's Unicode, I18N, and cross-platform focus.
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