Documented the functionality of comparer function

[WallaceKelly]

Added a table that shows what the comparer function should return.

[glibnub]

OPS Build status updates of commit 19767cf:

🕙 Preparing: average preparing time is 59 sec(s)

[glibnub]

OPS Build status updates of commit 19767cf:

🕙 Full build: average full build time is 1 min(s) 58 sec(s) [calculated from last 2 build(s)]

Note: A full build takes more time than an incremental build. This is the expected behavior of the build system.

[glibnub]

OPS Build status updates of commit 19767cf:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
docs/conceptual/seq.tail['t]-function-[fsharp].md	⚠️Warning		Details
docs/conceptual/list.sortwith['t]-function-[fsharp].md	✅Succeeded

docs/conceptual/seq.tail['t]-function-[fsharp].md

• Line 48: [Warning] Invalid file link:(~/seq.head[&Add current F# release notes #39;t%5D-function-%5Bfsharp%5D.md).
• Line 77: [Warning] Invalid file link:(~/seq.head[&Add current F# release notes #39;t%5D-function-%5Bfsharp%5D.md).

For more details, please refer to the build report.

Note: If you changed an existing file name or deleted a file, broken links in other files to the deleted or renamed file are listed only in the full build report.