Fixed typo
Changed 'The index of the first character after the span.' to The index of the last character after the span' in description of doc.char_span
@@ -288,7 +288,7 @@ p
+row
+cell #[code end]
+cell int
- +cell The index of the first character after the span.
+ +cell The index of the last character after the span.
+row
+cell #[code label]
