[dcl.link] Use "obtained" rather than "gotten" in comment in example.

Fixes #274.

Author: zygoloid

source/declarations.tex

@@ -3189,19 +3189,19 @@
 extern "C" void f5() {
   extern void f4();             // OK: Name linkage (internal)
                                 // and function type linkage (C
-                                // language linkage) gotten from
+                                // language linkage) obtained from
                                 // previous declaration.
 }
 
 extern void f4();               // OK: Name linkage (internal)
                                 // and function type linkage (C
-                                // language linkage) gotten from
+                                // language linkage) obtained from
                                 // previous declaration.
 
 void f6() {
   extern void f4();             // OK: Name linkage (internal)
                                 // and function type linkage (C
-                                // language linkage) gotten from
+                                // language linkage) obtained from
                                 // previous declaration.
 }
 \end{codeblock}