feat(docs): finish part 2

Signed-off-by: Alex Chi <iskyzh@gmail.com>

mini-lsm-starter/src/table/builder.rs

@@ -14,7 +14,7 @@ pub struct SsTableBuilder {
 }
 
 impl SsTableBuilder {
-    /// Create a builder based on target SST size and target block size.
+    /// Create a builder based on target block size.
     pub fn new(block_size: usize) -> Self {
         unimplemented!()
     }