Clarify script comments

Author: ColtonWilley

scripts/env-setup

@@ -45,7 +45,7 @@ WOLFSSL_LIB_PATH="$REPO_ROOT/wolfssl-install/lib"
 WOLFPROV_LIB_PATH="$REPO_ROOT/wolfprov-install/lib"
 
 # Always reconstruct LD_LIBRARY_PATH with correctly detected OPENSSL_LIB_PATH
-# (avoids conditional assignment that would skip update if LD_LIBRARY_PATH already set)
+# ${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH} expands to :$LD_LIBRARY_PATH only if LD_LIBRARY_PATH was already set
 export LD_LIBRARY_PATH="$WOLFSSL_LIB_PATH:$OPENSSL_LIB_PATH${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
 
 # Auto-detect FIPS mode and use appropriate config