Grammar & Clarity Fixes in Documentation (#298)

Hyphenation Fix (examples/agent-kit-langgraph/README.md)

General purpose agent → General-purpose agent (correct compound
adjective usage).
Preposition Fix (guides/add_your_own_tool.md)

Add supporting functions in SolanaAgentKit → Add supporting functions to
SolanaAgentKit (correct preposition).
Article Addition (guides/add_your_own_tool.md)

Define Action class for given tool → Define an Action class for given
tool (correct article usage).
Heading Consistency Fix (guides/add_your_own_tool.md)

### 7. Define Action class for given tool → ### 7. Define an Action
class for given tool (matches corrected phrasing).

Author: michaelessiet

examples/agent-kit-langgraph/README.md

@@ -8,7 +8,7 @@ This example demonstrates how to build an advanced Solana agent using LangGraph
 
 - Multi-agent architecture using LangGraph's StateGraph
 - Specialized agents for different tasks:
-  - General purpose agent for basic queries (with optional Tavily search integration)
+  - General-purpose agent for basic queries (with optional Tavily search integration)
   - Transfer/Swap agent for transaction operations
   - Read agent for blockchain data queries
   - Manager agent for routing and orchestration

guides/add_your_own_tool.md

@@ -6,11 +6,11 @@ Extending the **Solana Agent Kit** with custom tools allows you to add specializ
 
 1. Create a new tool file
 2. Export the new tool
-3. Add supporting functions in SolanaAgentKit
+3. Add supporting functions to SolanaAgentKit
 4. Implement the Langchain tool class
 5. Export the Langchain tool
 6. Export your protocol's langchain tools (if not already exported)
-7. Define Action class for given tool
+7. Define an Action class for given tool
 8. Export Action
 9. Use the custom tool
 
@@ -87,7 +87,7 @@ export * from "./tiplink";
 export * from "./your_protocol"; // Add your protocol here if it's not already in the list
 ```
 
-### 7. Define Action class for given tool
+### 7. Define an Action class for given tool
 
 > `src/actions/your_protocol/custom_action.ts`
 ```typescript:src/actions/your_protocol/custom_action.ts