Add examples in "Segments" guide

[PaulRBerg]

We need to add some code snippets in the Segments in which we show how different curves get generated from mathematical values.

[PaulRBerg]

@gavriliumircea what are the segment values used in the UI for the Exponential stream? Could you share them here, please?

[PaulRBerg]

The UI uses a segment value of 3 (i.e. 3e18) for the Exponential shape:

• https://github.com/sablier-labs/v2-interfaces/blob/2038bd0176a31100b0f502f3cfcce50a2993b437/apps/client/src/extensions/Exponential/config.ts#L10
• https://github.com/sablier-labs/v2-interfaces/blob/2038bd0176a31100b0f502f3cfcce50a2993b437/apps/client/src/extensions/ExponentialCliff/config.ts#L31

[PaulRBerg]

The code in the V2 sandbox might help with this:

https://github.com/sablier-labs/v2-sandbox