Updated balancer EA READMEs with descriptions for MAX_PAYLOAD_SIZE_LIMIT

[karen-stepanyan]

DF-20246

Added known issues section in README files for balancer EAs that explains the connection between MAX_PAYLOAD_SIZE_LIMIT env var the EA supports and Nginx config.

Note for reviewer. Ideally this should apply to all EAs, although is currently relevant to balancer EAs as they accept an array of any size as an input parameter. I'm open to include this description in the ea-framework itself, but since the ea-framework configs are not linked to EA READMEs, I'm also ok having those explicitly in balancer EAs READMEs for now

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[mxiao-cll]

Can we just put content in one file and point to that file?

[karen-stepanyan]

@mxiao-cll As I mentioned in the PR description, ideally we should have the content in a ea-framework repo and just point to it from EA READMEs, there is a separate ticket for that. Until that is done we can have the content here for each README

[mmcallister-cll]

these EAs all correspond to ones used by proof-of-reserves as indexers (@mxiao-cll for visibility), possibly affected by growing address lists, right?

[karen-stepanyan]

@mmcallister-cll Yes. It seems that i've missed couple but don't think they are used that much.

[mmcallister-cll]

Yeah I think we're good with this set, can always move to the others as well