reworking article to better account for past tense

_i18n/en/resources/moneropedia/ringCT.md

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 terms: ["ringCT", "ring-CT"]
-summary: "a way to hide the amount sent in a Monero transaction"
+summary: "an old way to hide the amount sent in a Monero transaction"
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 ### The Basics
-RingCT, short for Ring Confidential Transactions, is how transaction amounts are hidden in Monero.
-
-Ring CT was implemented in block #1220516 in January 2017.  After September 2017, this feature became mandatory for all transactions on the network.
+RingCT short for Ring Confidential Transactions. 
 
 RingCT introduces an improved version of @ring-signatures called "A Multi-layered Linkable Spontaneous Anonymous Group signature", which allows for hidden amounts, origins and destinations of transactions with reasonable efficiency and verifiable, trustless coin generation.
 
-RingCT technology was replaced by the more efficient @Bulletproofs in October 2018
+Ring CT was implemented in block #1220516 in January 2017.  After September 2017, this feature became mandatory for all transactions on the network. RingCT was replaced by the more efficient @Bulletproofs in October 2018.
 
 For more information, please read the creator Shen Noether's paper [here](https://eprint.iacr.org/2015/1098).