Update billing.mdx

[marcusrein]

Added two videos on adding GRT using a crypto wallet and multisig.

[github-actions]

📦 Next.js Bundle Analysis for @graphprotocol/docs

This analysis was generated by the Next.js Bundle Analysis action. 🤖

Six Pages Changed Size

The following pages changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load	% of Budget (350 KB)
/de/arbitrum/l2-transfer-tools-guide	11.62 KB	673.57 KB	192.45% (+/- <0.01%)
/ha/release-notes/assemblyscript-migration-guide	10.86 KB	672.81 KB	192.23% (+/- <0.01%)
/hi/arbitrum/l2-transfer-tools-guide	14.19 KB	676.14 KB	193.18% (+/- <0.01%)
/mr/arbitrum/l2-transfer-tools-guide	13.59 KB	675.54 KB	193.01% (+/- <0.01%)
/ur/arbitrum/l2-transfer-tools-guide	13.38 KB	675.33 KB	192.95% (+/- <0.01%)
/vi/arbitrum/l2-transfer-tools-guide	11.62 KB	673.57 KB	192.45% (+/- <0.01%)

Details

Only the gzipped size is provided here based on an expert tip.

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The "Budget %" column shows what percentage of your performance budget the First Load total takes up. For example, if your budget was 100kb, and a given page's first load size was 10kb, it would be 10% of your budget. You can also see how much this has increased or decreased compared to the base branch of your PR. If this percentage has increased by 20% or more, there will be a red status indicator applied, indicating that special attention should be given to this. If you see "+/- <0.01%" it means that there was a change in bundle size, but it is a trivial enough amount that it can be ignored.

[benface]

Nitpick, but I feel like the word "this" should be included in the link:

Suggested change

	For a video walkthrough of adding GRT to your billing balance using a crypto wallet, watch this [video](https://youtu.be/4Bw2sh0FxCg).
	For a video walkthrough of adding GRT to your billing balance using a crypto wallet, watch [this video](https://youtu.be/4Bw2sh0FxCg).

[benface]

Suggested change

	For a video walkthrough of adding GRT to your billing balance using a multisig wallet, watch this [video](https://youtu.be/eCgxp1Rag_0).
	For a video walkthrough of adding GRT to your billing balance using a multisig wallet, watch [this video](https://youtu.be/eCgxp1Rag_0).

[benface]

Looks good, just left two nitpicky comments.

One more thing: maybe you didn't know, but the docs support YouTube embeds with the <VideoEmbed> component. There's an example on this page (line 214).