Alpine allocations docs updates

[Trevhall52]

This pull request encompasses all of the necessary changes for the Ascent / Peak allocation renewal story RC-3846. Included items are as follows:

• Updating the new sizes of allocations, from 250,000->350,000 for Ascent allocations and 5,000,000->6,000,000 for Peak allocations
• A link to an updated Peak Supplementary Information form, containing the fixed GPU partition weights (5.1->6.1)
• A 3-step guide for renewing an allocation, with a link to the form which is already set up to populate a ticket
• seff-array documentation, including examples
• Fixes for a couple of spelling errors
• An updated chart displaying each allocation tier