Added a missing punctuation to improve clarity in documentation

[anushkasomani]

Description:
I made a minor grammatical improvement to the documentation by adding a comma after "For some solutions" in the paragraph:

"For some solutions, the Layer 2 instance then batches them into groups before anchoring them to Layer 1, after which they are secured by Layer 1 and cannot be altered. The details of how this is done vary significantly between different Layer 2 technologies and implementations."

This small change improves readability.

Related Issue:
N/A (This is a small change, not related to an open issue.)

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