Fix articles

Author: vslinko

src/connection/__tests__/arrayconnection.js

@@ -476,7 +476,7 @@ describe('connectionFromArray()', () => {
           letters,
           {first: 0}
         );
-      }).to.throw('Argument "first" must be an non-negative integer');
+      }).to.throw('Argument "first" must be a non-negative integer');
     });
 
     it('throws an error if last <= 0', () => {
@@ -485,7 +485,7 @@ describe('connectionFromArray()', () => {
           letters,
           {last: 0}
         );
-      }).to.throw('Argument "last" must be an non-negative integer');
+      }).to.throw('Argument "last" must be a non-negative integer');
     });
 
     it('returns all elements if cursors are invalid', () => {

src/connection/arrayconnection.js

@@ -86,7 +86,7 @@ export function connectionFromArraySlice<T>(
   );
   if (typeof first === 'number') {
     if (first <= 0) {
-      throw new Error('Argument "first" must be an non-negative integer');
+      throw new Error('Argument "first" must be a non-negative integer');
     }
 
     endOffset = Math.min(
@@ -96,7 +96,7 @@ export function connectionFromArraySlice<T>(
   }
   if (typeof last === 'number') {
     if (last <= 0) {
-      throw new Error('Argument "last" must be an non-negative integer');
+      throw new Error('Argument "last" must be a non-negative integer');
     }
 
     startOffset = Math.max(