Organize documents and fix links.

database/stats.md

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+## Command description
+
+This operation will show the statistics that have been stored locally on your environment.
+
+## Command usage
+
+```aaru -d [true/false] -v [true/false] database stats -h [true/false]```
+
+```-d, --debug [true/false]``` shows debug output *(default false)*
+
+```-v, --verbose [true/false]``` shows verbose output *(default false)*
+
+```-h, --help [true/false]``` shows help screen for the command instead of running it, ignores all other switches *(
+default false)*
+
+## Example
+
+```aaru database stats```
+
+## Operating system support
+
+| FreeBSD | macOS | Linux | Windows |
+|---|---|---|---|
+| Yes | Yes | Yes | Yes |