doc: stdlib: changes standard object messages to kebab-case

doc/standard-library.txt

@@ -30,10 +30,10 @@ version: 1.0
 
       -is:
       -implements:
-      -respondsTo:
-      -doesNotUnderstand(selector:args:)
-      -sendMsg(selector:args:)
-      -toString
+      -responds-to:
+      -does-not-understand(selector:args:)
+      -send-msg(selector:args:)
+      -to-string
 
 
    3.2 Int
@@ -78,8 +78,8 @@ version: 1.0
 
       -size
       -exists:
-      -put:at:
-      -get:
+      -at:
+      -at:put:
       -map:
       -select:
       -select:collect:
@@ -92,7 +92,7 @@ version: 1.0
    Messages:
 
       -value
-      -moveNext
+      -move-next
       -select:
       -select:collect:
       -iterator
@@ -103,7 +103,7 @@ version: 1.0
 
    Messages:
 
-      -argCount
+      -arg-count
       -call
       -call:
       -call(_:_:)
@@ -130,7 +130,7 @@ version: 1.0
 
       -msg
       -data
-      -withMsg:andData:
+      -with-msg:and-data:
 
 
 4 std.io