[doc] Drop the stray parameter from the on_bool handler docs

[karpovantonme]

The handler concept in basic_parser.hpp documents on_bool as taking the remaining characters:

/// Called when a boolean is parsed.
///
/// @return `true` on success.
/// @param b The value
/// @param s The remaining characters
/// @param ec Set to the error, if any occurred.
///
bool on_bool( bool b, error_code& ec );

There is no s. The line is a copy of the one in on_double right above it, which does take a string_view. on_null below has no such line, so on_bool is the only handler affected.

It matters a little more than a normal typo because this block is the specification users write their own handler against, so it tells them to expect an argument the parser never passes.

One line, comment only. I checked the rest of the library the same way and this is the only mismatch in it.

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2026-08-03 15:03:51 UTC

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