PL Editor and %Cx Comment format symbol

[bobc]

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In section 4.1:

%Cx = comment (x = 0 to 9 to identify the comment)

This might be allowed inside PL Editor, but eeschema and pcbnew only support 4 comment fields, so the statement is quite misleading.

Suggest change to

%Cx = comment (x = 0 to 3 to identify the comment)