AP_FlashStorage: Fix some typos

Fixed some typos found in the code.

libraries/AP_FlashStorage/AP_FlashStorage.cpp

@@ -152,7 +152,7 @@ bool AP_FlashStorage::switch_full_sector(void)
 }
 
 // protected_switch_full_sector is protected by switch_full_sector to
-// avoid an infinite recursion problem; switch_full_sectory calls
+// avoid an infinite recursion problem; switch_full_sector calls
 // write() which can call switch_full_sector.  This has been seen in
 // practice, and while it might be caused by corruption... corruption
 // happens.

libraries/AP_FlashStorage/AP_FlashStorage.h

@@ -236,7 +236,7 @@ private:
     bool switch_sectors(void) WARN_IF_UNUSED;
 
     // _switch_full_sector is protected by switch_full_sector to avoid
-    // an infinite recursion problem; switch_full_sectory calls
+    // an infinite recursion problem; switch_full_sector calls
     // write() which can call switch_full_sector.  This has been seen
     // in practice.
     bool protected_switch_full_sector(void) WARN_IF_UNUSED;