add eosio 2.0.10 release notes to dev portal :doc

docs/30_release-notes/89_v2.9.10.md

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+---
+link: /30_release-notes/index.md
+link_text: v2.0.10
+---

docs/30_release-notes/90_v2.0.9.md

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 ---
-link: /30_release-notes/index.md
+content_title: EOSIO v2.0.9 Release Notes
 link_text: v2.0.9
 ---
+
+This release contains security and miscellaneous fixes.
+
+## Security bug fixes
+
+### Consolidated Security Fixes for 2.0.9 ([#9841](https://github.com/EOSIO/eos/pull/9841))
+- Fixes to packed_transaction cache
+- Transaction account fail limit refactor
+
+Note: These security fixes are relevant to all nodes on EOSIO blockchain networks.
+
+## Other Changes
+- ([#9803](https://github.com/EOSIO/eos/pull/9803)) Fix stdout console logging: Merge back #9582 to 2.0.x

docs/30_release-notes/index.md

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 ---
-content_title: EOSIO v2.0.9 Release Notes
+content_title: EOSIO v2.0.10 Release Notes
 ---
 
-This release contains security and miscellaneous fixes.
+This release contains security, stability, and miscellaneous fixes.
 
 ## Security bug fixes
 
-### Consolidated Security Fixes for 2.0.9 ([#9841](https://github.com/EOSIO/eos/pull/9841))
-- Fixes to packed_transaction cache
-- Transaction account fail limit refactor
+### Consolidated Security Fixes for v2.0.10 ([#10091](https://github.com/EOSIO/eos/pull/10091))
+- Fix issue with account query db that could result in incorrect data or hung processes 
+- Implement a Subjective CPU billing system that helps P2P and API nodes better respond to extreme network congestion
 
 Note: These security fixes are relevant to all nodes on EOSIO blockchain networks.
 
-## Other Changes
-- ([#9803](https://github.com/EOSIO/eos/pull/9803)) Fix stdout console logging: Merge back #9582 to 2.0.x
+### Notes on Subjective CPU Billing
+
+This system consists of two primary features: a subjective (node local) view of spent CPU resources that are not yet accounted for by the blockchain that allows individual nodes to predict what resource consumption will be and, a subjective penalty system to offset work done in service of erroneous or malicious transactions. 
+
+The subjective view of CPU resources will synchronize with the resources present in the blockchain as it discovers the true CPU billing for transactions it has already accounted for.
+
+The system will also accumulate CPU resources spent on failing transactions that will not be relayed in a decaying "subjective penalty" which can protect the individual nodes from abusive actors while remaining tolerant to occasional mistakes. 
+
+Subjective billing defaults to active and can be disabled with the `disable-subjective-billing` configuration in `config.ini` or on the command line. 
+
+## Stability bug fixes
+- ([#9985](https://github.com/EOSIO/eos/pull/9985)) EPE-389 net_plugin stall during head catchup - merge release/2.0.x
+
+## Other changes
+- ([#9894](https://github.com/EOSIO/eos/pull/9894)) EOS VM OC: Support LLVM 11 - 2.0
+- ([#9911](https://github.com/EOSIO/eos/pull/9911)) add step to the pipeline to build and push to dockerhub on release br…
+- ([#9944](https://github.com/EOSIO/eos/pull/9944)) Create eosio-debug-build Pipeline
+- ([#9969](https://github.com/EOSIO/eos/pull/9969)) Updating name for the new Docker hub repo EOSIO instead EOS
+- ([#9971](https://github.com/EOSIO/eos/pull/9971)) Fix pinned builds error due to obsolete LLVM repo
+- ([#10015](https://github.com/EOSIO/eos/pull/10015)) [release 2.0.x] Fix LRT triggers
+- ([#10026](https://github.com/EOSIO/eos/pull/10026)) EPE-165: Improve logic for unlinkable blocks while sync'ing
+- ([#10047](https://github.com/EOSIO/eos/pull/10047)) Reduce Docker Hub Manifest Queries
+- ([#10088](https://github.com/EOSIO/eos/pull/10088)) [release 2.0.x] Specify boost version for unpinned MacOS 10.14 builds
+
+## Documentation
+- ([#10011](https://github.com/EOSIO/eos/pull/10011)) [docs] Update various cleos how-tos and fix index - 2.0