Documentation Text Corrections (#59)

* Update preface.md

* Update da-node.md

* Update security.md

docs/learn-more/security.md

@@ -104,7 +104,7 @@ We are happy to thank everyone who submits valid reports which help us improve t
 - The vulnerability must be a qualifying vulnerability
 - Any vulnerability found must be reported no later than 24 hours after discovery and exclusively through hackenproof.com
 - You must send a clear textual description of the report along with steps to reproduce the issue, include attachments such as screenshots or proof of concept code as necessary.
-- You must not be a former or current employee of us or one of its contractor.
+- You must not be a former or current employee of us or one of its contractors.
 - ONLY USE the EMAIL under which you registered your HackenProof account (in case of violation, no bounty can be awarded)
 - Provide detailed but to-the point reproduction steps
 

docs/run-a-node/da-node.md

@@ -6,7 +6,7 @@ import TabItem from '@theme/TabItem';
 
 # Data Availability Node
 ---
-While there are various approaches to running a DA (Data Availability) node, this guide outlines our recommended method and the necessary hardware specifications. DA Nodes performs the core functions of verifying, signing, and storing encoded blob data. It's important to note that your DA signer needs to operate a DA node to verify encoded blob data, sign it, and store it for future farming and rewards. Currently, in order to run a DA Node on Testnet, users must stake 10 A0GI tokens. These can be obtained via our [faucet](https://faucet.0g.ai/) or via rewards from running Storage Nodes or Validator Nodes. You can also reach out to our technical moderators on [Discord](https://discord.com/invite/0glabs).
+While there are various approaches to running a DA (Data Availability) node, this guide outlines our recommended method and the necessary hardware specifications. DA Nodes perform the core functions of verifying, signing, and storing encoded blob data. It's important to note that your DA signer needs to operate a DA node to verify encoded blob data, sign it, and store it for future farming and rewards. Currently, in order to run a DA Node on Testnet, users must stake 10 A0GI tokens. These can be obtained via our [faucet](https://faucet.0g.ai/) or via rewards from running Storage Nodes or Validator Nodes. You can also reach out to our technical moderators on [Discord](https://discord.com/invite/0glabs).
 
 ## Hardware Requirements