Add missing memory metrics explanation to documentation page

**Did you search GitHub Issues and GitHub Discussions First?**
Yes

**Is your feature request related to a problem? Please describe.**
Yes. The current documentation lacks definitions for several key memory metrics reported by the `INFO `command, making troubleshooting memory usage difficult for users.

**Describe the solution you'd like**
Update the [info command documentation page](https://www.dragonflydb.io/docs/command-reference/server-management/info) to include detailed explanations and definitions for all metrics present in the `# Memory `section (ex: `object_used_memory`, `type_used_memory_string`, `table_used_memory`, etc.)

**Describe alternatives you've considered**
N/A

**Additional context**
N/A