Remove section comments

Author: alexander-yevsyukov

server/src/main/java/io/spine/server/tuple/Pair.java

@@ -119,10 +119,6 @@ public B getB() {
         return value(this, 1);
     }
 
-    /*
-     * Companion code
-     *******************/
-
     @CanIgnoreReturnValue
     private static <M extends Message> M checkNotNullOrEmpty(M value) {
         return checkNotNullOrEmpty(Pair.class, value);

server/src/main/java/io/spine/server/tuple/Quartet.java

@@ -127,10 +127,6 @@ public D getD() {
         return value(this, 3);
     }
 
-    /*
-     * Companion code
-     *******************/
-
     @CanIgnoreReturnValue
     private static <M extends Message> M checkNotNullOrEmpty(M value) {
         return checkNotNullOrEmpty(Quartet.class, value);

server/src/main/java/io/spine/server/tuple/Quintet.java

@@ -155,10 +155,6 @@ public E getE() {
         return value(this, 4);
     }
 
-    /*
-     * Companion code
-     *******************/
-
     @CanIgnoreReturnValue
     private static <M extends Message> M checkNotNullOrEmpty(M value) {
         return checkNotNullOrEmpty(Quintet.class, value);

server/src/main/java/io/spine/server/tuple/Triplet.java

@@ -106,10 +106,6 @@ public C getC() {
         return value(this, 2);
     }
 
-    /*
-     * Companion code
-     *******************/
-
     @CanIgnoreReturnValue
     private static <M extends Message> M checkNotNullOrEmpty(M value) {
         return checkNotNullOrEmpty(Triplet.class, value);