fix typos

Author: HoLo85

src/SD.cpp

@@ -376,7 +376,7 @@ namespace SDLib {
     return card.lockCard(setLock, pwd);
   }
 
-  // !!CAUTION!! call this to completly erase a card,
+  // !!CAUTION!! call this to completely erase a card,
   // this will unlock a card but also delete the complete file system,
   // reformatting will be required!
   bool SDClass::forceEraseCard(){

src/SD.h

@@ -109,7 +109,7 @@ namespace SDLib {
       // lock card with a password
       bool lockCard(bool setLock, const char pwd);
       // !!CAUTION!! this can be used as last resort if the password of a locked card is unknown,
-      // this will remove the files and filesystem, a reformatting of the card is neccessary after this
+      // this will remove the files and filesystem, a reformatting of the card is necessary after this
       bool forceEraseCard();
 
     private:

src/utility/Sd2Card.cpp

@@ -822,7 +822,7 @@ bool Sd2Card::lockCard(bool setLock, const char *pwd){
   }
 }
 
-/** Completly erase a card
+/** Completely erase a card
   !! Use with caution !! this removes everything from a card, even the file system.
   Use this to remove a lock with an unknown password from a card.