Better atomic comment aligned with the target

Author: Nassiel

compiler/rustc_target/src/spec/riscv32imac_esp_espidf.rs

@@ -15,11 +15,8 @@ pub fn target() -> Target {
             linker: Some("riscv32-esp-elf-gcc".into()),
             cpu: "generic-rv32".into(),
 
-            // While the RiscV32IMC architecture does not natively support atomics, ESP-IDF does support
-            // the __atomic* and __sync* GCC builtins, so setting `max_atomic_width` to `Some(64)`
-            // and `atomic_cas` to `true` will cause the compiler to emit libcalls to these builtins.
-            //
-            // Support for atomics is necessary for the Rust STD library, which is supported by the ESP-IDF framework.
+            // As RiscV32IMAC architecture does natively support atomics,
+            // automatically enable the support for the Rust STD library.
             max_atomic_width: Some(64),
             atomic_cas: true,