fix some clippy lints (#288)

src/search_buffer.rs

@@ -1,9 +1,9 @@
 /*!
-The search_buffer module is responsible for searching a single file all in a
+The `search_buffer` module is responsible for searching a single file all in a
 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 does.
+Note that this module doesn't quite support everything that `search_stream` does.
 Notably, showing contexts.
 */
 use std::cmp;