Improve expiration infos

gpg.md

@@ -5,10 +5,14 @@
 - Edit Key: `gpg --edit-key <keyid>`
 - Update Primary Key
     - Select primary key: `key 0`
-    - Select expiration date: `exipre`
+    - Select expiration date: `expire`
     - Enter duration
 - Update Sub-Key
     - Select sub key: `key 1`
     - Update expiration: `expire`
     - Enter duration
-    - May have to repeat these steps for `key 2 ...` 
+- May have to repeat these steps for `key 2 ...`
+- Exit: `save` and `quit`
+
+## Export key
+- `gpg --armor --export <emailOfKey>`