Update SWC-102.md (code comments, note unmaintained status)

Update SWC-102.md

entries/docs/SWC-102.md

@@ -1,3 +1,15 @@
+# Please note, this content is no longer actively maintained.
+
+The content of the SWC registry has not been thoroughly updated since 2020. It is known to be incomplete and may contain errors as well as crucial omissions.
+
+For currently maintained guidance on known Smart Contract vulnerabilities written primarily as guidance for security reviewers, please see the
+[EEA EthTrust Security Levels specification](https://entethalliance.org/specs/ethtrust-sl). As well as the latest release version, an
+[Editor's draft](https://entethalliance.github.io/eta-registry/security-levels-spec.html) is available, 
+that represents the latest work of the group developing the specification.
+
+General guidance for developers on what to consider to ensure security, that is currently maintained, is also available through the 
+[Smart Contract Security Verification Standard (SCSVS)](https://github.com/ComposableSecurity/SCSVS).
+
 # Title
 
 Outdated Compiler Version
@@ -18,6 +30,11 @@ It is recommended to use a recent version of the Solidity compiler.
 
 - [Solidity Release Notes](https://github.com/ethereum/solidity/releases)
 - [Etherscan Solidity Bug Info](https://etherscan.io/solcbuginfo)
+- EEA EthTrust Security Levels:
+  - [**Level [S]** Compiler Security Bugs](https://entethalliance.org/specs/ethtrust-sl/#sec-1-compiler-bugs)
+  - [**Level [S]** Improved Compilers](https://entethalliance.org/specs/ethtrust-sl/#sec-1-compile-improvements)
+  - [**Level [M]** Compiler Bugs and Overriding Requirements](https://entethalliance.org/specs/ethtrust-sl/#sec-level-2-compiler-bugs)
+  - [**Recommended Practice** Use the Latest Compiler](https://entethalliance.org/specs/ethtrust-sl/#req-R-use-latest-compiler)
 
 ## Samples
 
@@ -31,3 +48,14 @@ contract OutdatedCompilerVersion {
 }
 
 ```
+
+#### Comments
+
+As of August 2023 the current version of the compiler is 0.8.21. There are several dozen compiler bugs that have been fixed between that and version 0.4.13,
+each of which can lead to data being corrupted, contracts not functioning as expected, or unexpected vulnerabilities in contracts. 
+There have also been significant improvements in compiler capabilities to protect against errors.
+
+See also the sections [**Level [S]** Compiler Security Bugs](https://entethalliance.org/specs/ethtrust-sl/#sec-1-compiler-bugs),
+[**Level [S]** Improved Compilers](https://entethalliance.org/specs/ethtrust-sl/#sec-1-compile-improvements), and
+[**Level [M]** Compiler Bugs and Overriding Requirements](https://entethalliance.org/specs/ethtrust-sl/#sec-level-2-compiler-bugs)
+