Fix typos in header layout docs and Durability descriptions

docs/design.md

@@ -31,8 +31,8 @@ database file.
 | magic number                                                                                   |
 | magic con.| god byte  | padding               | page size                                      |
 | region header pages                           | region max data pages                          |
-| region tracker page number                                                                     |
 | number of full regions                        | data pages in trailing region                  |
+| region tracker page number                                                                     |
 | padding                                                                                        |
 | padding                                                                                        |
 | padding                                                                                        |

src/transactions.rs

@@ -167,9 +167,9 @@ pub enum Durability {
     /// the ability to cause the database process to crash, can cause invalid data to be written
     /// with a valid checksum, leaving the database in an invalid, attacker-controlled state.
     Immediate,
-    /// Commits with this durability level have the same gaurantees as [`Durability::Immediate`]
+    /// Commits with this durability level have the same guarantees as [`Durability::Immediate`]
     ///
-    /// Additionally, aata is written with the following 2-phase commit algorithm:
+    /// Additionally, data is written with the following 2-phase commit algorithm:
     ///
     /// 1. Update the inactive commit slot with the new database state
     /// 2. Call `fsync` to ensure the database slate and commit slot update have been persisted