Fix clang -Weverything

example/tutorial/tutorial.cpp

@@ -121,17 +121,17 @@ int main(int, char*[]) {
     // This version of SetString() needs an allocator, which means it will allocate a new buffer and copy the the string into the buffer.
     Value author;
     {
-        char buffer[10];
-        int len = sprintf(buffer, "%s %s", "Milo", "Yip");  // synthetic example of dynamically created string.
+        char buffer2[10];
+        int len = sprintf(buffer2, "%s %s", "Milo", "Yip");  // synthetic example of dynamically created string.
 
-        author.SetString(buffer, static_cast<size_t>(len), document.GetAllocator());
+        author.SetString(buffer2, static_cast<SizeType>(len), document.GetAllocator());
         // Shorter but slower version:
         // document["hello"].SetString(buffer, document.GetAllocator());
 
         // Constructor version: 
         // Value author(buffer, len, document.GetAllocator());
         // Value author(buffer, document.GetAllocator());
-        memset(buffer, 0, sizeof(buffer)); // For demonstration purpose.
+        memset(buffer2, 0, sizeof(buffer2)); // For demonstration purpose.
     }
     // Variable 'buffer' is unusable now but 'author' has already made a copy.
     document.AddMember("author", author, document.GetAllocator());