docs: enhance PR-Agent Pro overview and update image sizes in tools documentation

Author: mrT23

docs/docs/overview/pr_agent_pro.md

@@ -11,6 +11,8 @@ PR-Agent Pro is designed for companies and teams that require additional feature
 
 **Additional features:**
 
+Here are some of the additional features and capabilities that PR-Agent Pro offers:
+
 | Feature                                                                                                              | Description                                                                                                                                                      |
 |----------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | [**Model selection**](https://pr-agent-docs.codium.ai/usage-guide/PR_agent_pro_models/#pr-agent-pro-models)          | Choose the model that best fits your needs, among top models like `GPT4` and `Claude-Sonnet-3.5`                                                                 
@@ -26,6 +28,8 @@ PR-Agent Pro is designed for companies and teams that require additional feature
 
 **Additional tools:**
 
+Here are additional tools that are available only for PR-Agent Pro users:
+
 | Feature | Description |
 |---------|-------------|
 | [**Custom Prompt Suggestions**](https://pr-agent-docs.codium.ai/tools/custom_prompt/) | Generate code suggestions based on custom prompts from the user |

docs/docs/tools/improve.md

@@ -63,9 +63,9 @@ Note that PR-Agent pro tracks two types of implementations:
 
 In post-process, PR-Agent counts the number of suggestions that were implemented, and provides general statistics and insights about the suggestions' impact on the PR process.
 
-![code_suggestions_asses_impact_stats_1](https://codium.ai/images/pr_agent/code_suggestions_asses_impact_stats_1.png){width=384}
+![code_suggestions_asses_impact_stats_1](https://codium.ai/images/pr_agent/code_suggestions_asses_impact_stats_1.png){width=512}
 
-![code_suggestions_asses_impact_stats_2](https://codium.ai/images/pr_agent/code_suggestions_asses_impact_stats_2.png){width=384}
+![code_suggestions_asses_impact_stats_2](https://codium.ai/images/pr_agent/code_suggestions_asses_impact_stats_2.png){width=512}
 
 
 ## Usage Tips