fix typo in comment

src/search_buffer.rs

@@ -4,7 +4,7 @@ single buffer. Typically, the source of the buffer is a memory map. This can
 be useful for when memory maps are faster than streaming search.
 
 Note that this module doesn't quite support everything that `search_stream`
-Notdoes. ably, showing contexts.
+does. Notably, showing contexts.
 */
 use std::cmp;
 use std::path::Path;