Remove references to validator application form (MystenLabs#4055)

doc/src/contribute/faq.md

@@ -127,7 +127,7 @@ Not currently. Packages are immutable objects, and this property is relied upon
 
 ### Is there any information on node architecture and running validators on Sui?
 
-Yes! You can now [register to participate](https://airtable.com/shr3phh3FCZYhZUDF) in [Sui Incentivized Testnet as a validator](https://sui.io/resources-sui/validator-registration-open/)!
+Yes! See the [Sui Incentivized Testnet as a validator](https://sui.io/resources-sui/validator-registration-open/) announcement.
 
 Section four in the [Sui Smart Contract Platform](https://github.com/MystenLabs/sui/blob/main/doc/paper/sui.pdf) white paper is the best reference for node architecture.
 
@@ -136,8 +136,6 @@ See the instructions to [run a Sui Fullnode](../build/fullnode.md).
 
 ### Can I run a Sui validator node?
 
-You can now [register to participate](https://airtable.com/shr3phh3FCZYhZUDF) in [Sui Incentivized Testnet as a validator](https://sui.io/resources-sui/validator-registration-open/)!
-
 We have a public [Sui Devnet](../build/devnet.md) with nodes operated by Mysten Labs. And you can now run a networked [Sui Fullnode](../build/fullnode.md).
 
 You may also run a local, non-networked Sui node for development using the [Sui CLI client](../contribute/cli-client.md). You can interact with the nodes with either the [Sui Wallet CLI](../contribute/cli-client.md#command-line-mode) or over the [Sui RPC API](../build/json-rpc.md).

doc/src/learn/architecture/validators.md

@@ -4,8 +4,6 @@ title: Validators
 
 The Sui network is operated by a set of independent *validators*, each running its own instance of the Sui software on a separate machine (or a sharded cluster of machines operated by the same entity). A validator participates in the network by handling read and write requests sent by clients. This section focuses on the latter.
 
-> **Important:** You can now [register to participate](https://airtable.com/shr3phh3FCZYhZUDF) in [Sui Incentivized Testnet as a validator](https://sui.io/resources-sui/validator-registration-open/)!
-
 Sui uses proof of stake (PoS) to determine which validators operate the network and their voting power. Validators are incentivized to participate in good faith via a share of transaction fees, staking rewards, and slashing to punish misbehavior.
 
 ## Epochs

doc/src/learn/index.md

@@ -16,7 +16,6 @@ The following list includes the recent updates to Sui and the documentation:
 
 * Interact with the Sui network using our new [Rust SDK](../build/rust-sdk.md), a collection of Rust language [JSON-RPC wrapper and crypto utilities](https://github.com/MystenLabs/sui/tree/main/crates/sui-sdk).
 * Sui now supports development using [Microsoft Windows 11, macOS, and Linux](../build/install.md#supported-oses). See [install Sui](../build/install.md#prerequisites) for the prerequisites of each operating system.
-* You can now [register to participate](https://airtable.com/shr3phh3FCZYhZUDF) in [Sui Incentivized Testnet as a validator](https://sui.io/resources-sui/validator-registration-open/)!
 * This site is now available in two versions in the menu at top left: the default and stable [Devnet](https://docs.sui.io/devnet/learn) branch and the [Latest build](https://docs.sui.io/learn) upstream `main` branch. Use the `devnet` version for app development on top of Sui. Use the Latest build `main` branch for  [contributing to the Sui blockchain](../contribute/index.md) itself. Always check and submit fixes to the `main` branch.
 * `sui::id` is now `sui::object` and `VersionedID` is now `Info`. Use the [Object module](https://github.com/MystenLabs/sui/blob/main/crates/sui-framework/sources/object.move) that has [replaced the former ID.move.](https://github.com/MystenLabs/sui/pull/3241)
 * Find a list of [single-writer apps](../learn/single-writer-apps.md) that would benefit from Sui's advantages in handling [simple transactions](../learn/how-sui-works.md#simple-transactions).