Add better examples to find()

[tmaklin]

/

/ ```rust

/ use sablast::build;

/ use sablast::find;

/ use sablast::index::BuildOpts;

/ use sablast::derandomize::DerandomizeOpts;

/ use kbo::build;

/ use kbo::find;

/ use kbo::FindOpts;

/ use kbo::index::BuildOpts;

/ use kbo::format::RLE;

/

/ let reference: Vec<Vec<u8>> = vec![vec![b'A',b'A',b'A',b'G',b'A',b'A',b'C',b'C',b'A',b'-',b'T',b'C',b'A',b'G',b'G',b'G',b'C',b'G']];

/ let mut opts = BuildOpts::default();

https://github.com/tmaklin/sablast/blob/102a2e359c52082a7c098970b66184280c0603d5/src/lib.rs#L473

/// 4. Number of mismatches and 1-character insertions in the block.
///
/// # Examples
///
/// TODO Add better examples to find()
///
/// ```rust
/// use kbo::build;
/// use kbo::find;
/// use kbo::FindOpts;
/// use kbo::index::BuildOpts;
/// use kbo::format::RLE;
///
/// let reference: Vec<Vec<u8>> = vec![vec![b'A',b'A',b'A',b'G',b'A',b'A',b'C',b'C',b'A',b'-',b'T',b'C',b'A',b'G',b'G',b'G',b'C',b'G']];
/// let mut opts = BuildOpts::default();