implementation defined を implementation-defined に変更

Author: Raclamusi

reference/cstdio/eof.md

@@ -3,7 +3,7 @@
 * macro[meta id-type]
 
 ```cpp
-#define EOF /* implementation defined */
+#define EOF /* implementation-defined */
 ```
 
 ## 概要

reference/cstdio/filename_max.md

@@ -3,7 +3,7 @@
 * macro[meta id-type]
 
 ```cpp
-#define FILENAME_MAX /* implementation defined */
+#define FILENAME_MAX /* implementation-defined */
 ```
 
 ## 概要

reference/cstdlib/rand_max.md

@@ -3,7 +3,7 @@
 * macro[meta id-type]
 
 ```cpp
-#define RAND_MAX /*implementation defined*/
+#define RAND_MAX /*implementation-defined*/
 ```
 
 ## 概要