changelog: reword feature as bugfix

Author: SylvainJuge

CHANGELOG.asciidoc

@@ -64,7 +64,6 @@ Even when matching on the main class name or on system properties,
 * Update Byte-buddy to `1.11.0` - {pull}1769[#1769]
 * Support for user.domain {pull}1756[#1756]
 * JAX-RS supports javax.ws.rs.PATCH
-* Optimize instrumentaion by avoiding stack-frame computation for Java7+ bytecode - {pull}1758[#1758]
 
 [float]
 ===== Bug fixes
@@ -75,6 +74,7 @@ Even when matching on the main class name or on system properties,
 * Fix `NullPointerException` on legacy Apache client instrumentation when host is `null` - {pull}1746[#1746]
 * Apply consistent proxy class exclusion heuristic - {pull}1738[#1738]
 * Fix micrometer serialization error - {pull}1741[#1741]
+* Optimize & avoid `ensureInstrumented` deadlock by skipping stack-frame computation for Java7+ bytecode - {pull}1758[#1758]
 
 [float]
 ===== Refactors