➕ add documentation for transactions operations (#13)

Co-authored-by: DoctorVee <vchinewubeze@reloadly.com>

Author: Doctor-Vee

SAMPLE-CODE.md

@@ -19,7 +19,7 @@
 
 * [Overview](https://github.com/Reloadly/reloadly-sdk-java/blob/main/java-sdk-giftcard/USAGE.md) (You should start here)
 * [Giftcard Discount Operations](https://github.com/Reloadly/reloadly-sdk-java/blob/main/java-sdk-giftcard/usage/GIFTCARD-DISCOUNT-OPERATIONS.md)
-* [Giftcard Order Operations](https://github.com/Reloadly/reloadly-sdk-java/blob/main/java-sdk-giftcard/GIFTCARD-ORDER-OPERATIONS.md)
-* [Giftcard Products Operations](https://github.com/Reloadly/reloadly-sdk-java/blob/main/java-sdk-giftcard/GIFTCARD-PRODUCTS-OPERATIONS.md)
-* [Giftcard Redeem Instructions Operations](https://github.com/Reloadly/reloadly-sdk-java/blob/main/java-sdk-giftcard/GIFTCARD-REDEEM-INSTRUCTIONS-OPERATIONS.md)
-* [Giftcard Transactions Operations](https://github.com/Reloadly/reloadly-sdk-java/blob/main/java-sdk-giftcard/GIFTCARD-TRANSACTIONS-OPERATIONS.md)
+* [Giftcard Order Operations](https://github.com/Reloadly/reloadly-sdk-java/blob/main/java-sdk-giftcard/usage/GIFTCARD-ORDER-OPERATIONS.md)
+* [Giftcard Products Operations](https://github.com/Reloadly/reloadly-sdk-java/blob/main/java-sdk-giftcard/usage/GIFTCARD-PRODUCTS-OPERATIONS.md)
+* [Giftcard Redeem Instructions Operations](https://github.com/Reloadly/reloadly-sdk-java/blob/main/java-sdk-giftcard/usage/GIFTCARD-REDEEM-INSTRUCTIONS-OPERATIONS.md)
+* [Giftcard Transactions Operations](https://github.com/Reloadly/reloadly-sdk-java/blob/main/java-sdk-giftcard/usage/GIFTCARD-TRANSACTIONS-OPERATIONS.md)

java-sdk-airtime/USAGE.md

@@ -107,7 +107,7 @@ Using the example above has some benefits and drawbacks:
 * However, because access tokens have a finite lifetime, you now have to manage or handle the expiration of the access
   token in your application code.
 * In the sample above, the AirtimeAPI will continue using the same access token until it expires. Therefore, the
-  responsibility false on you to handle token renewal when the token expires.
+  responsibility falls on you to handle token renewal when the token expires.
 
 ### Sample token expiration handling
 

java-sdk-giftcard/USAGE.md

@@ -114,7 +114,7 @@ Using the example above has some benefits and drawbacks:
 * However, because access tokens have a finite lifetime, you now have to manage or handle the expiration of the access
   token in your application code.
 * In the sample above, the `GiftcardAPI` will continue using the same access token until it expires. Therefore, the
-  responsibility false on you to handle token renewal when the token expires.
+  responsibility falls on you to handle token renewal when the token expires.
 
 ### Sample token expiration handling