add update documentation and example

Author: callensm

docs/resources/keypair.md

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+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "solana_keypair Resource - terraform-provider-solana"
+subcategory: ""
+description: |-
+  Genereate a random or grinded keypair compatible with the solana-keygen CLI.
+---
+
+# solana_keypair (Resource)
+
+Genereate a random or grinded keypair compatible with the `solana-keygen` CLI.
+
+## Example Usage
+
+```terraform
+# Random Keypair
+resource "solana_keypair" "key" {
+  output_path = "${path.module}/id.json"
+  random      = true
+}
+
+# Grind Keypair
+resource "solana_keypair" "key" {
+  output_path = "${path.module}/id.json"
+
+  grind {
+    prefix = "abc"
+  }
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- **output_path** (String) The file path to output the keypair into.
+
+### Optional
+
+- **grind** (Block Set, Max: 1) The grind options for the new keypair. (see [below for nested schema](#nestedblock--grind))
+- **id** (String) The ID of this resource.
+- **random** (Boolean) Whether to generate a random new keypair.
+
+### Read-Only
+
+- **private_key** (String, Sensitive) The randomly generated private key.
+- **public_key** (String) The randomly generated public key.
+
+<a id="nestedblock--grind"></a>
+### Nested Schema for `grind`
+
+Optional:
+
+- **prefix** (String) The desired prefix of the public key.
+- **suffix** (String) The desired suffix of the public key.
+- **threads** (Number) The number of threads to grind for the keypair (between 1-15).
+
+

docs/resources/random_keypair.md

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+# Random Keypair
+resource "solana_keypair" "key" {
+  output_path = "${path.module}/id.json"
+  random      = true
+}
+
+# Grind Keypair
+resource "solana_keypair" "key" {
+  output_path = "${path.module}/id.json"
+
+  grind {
+    prefix = "abc"
+  }
+}