Fix spelling mistakes

These were found with:
codespell -w $(git ls-files | grep "\.[hc]\(pp\)\?$")

At some point in the future, we might want to get this enabled in CI.

Change-Id: Iccb57b2adfd06a2e177e99db2923fe4e8e329118
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/http/complete_response_fields.hpp b/http/complete_response_fields.hpp
index a5b3eec..8323dca 100644
--- a/http/complete_response_fields.hpp
+++ b/http/complete_response_fields.hpp
@@ -32,14 +32,14 @@
         using http_helpers::ContentType;
         std::array<ContentType, 3> allowed{ContentType::CBOR, ContentType::JSON,
                                            ContentType::HTML};
-        ContentType prefered =
-            getPreferedContentType(req.getHeaderValue("Accept"), allowed);
+        ContentType preferred =
+            getPreferredContentType(req.getHeaderValue("Accept"), allowed);
 
-        if (prefered == ContentType::HTML)
+        if (preferred == ContentType::HTML)
         {
             json_html_util::prettyPrintJson(res);
         }
-        else if (prefered == ContentType::CBOR)
+        else if (preferred == ContentType::CBOR)
         {
             res.addHeader(boost::beast::http::field::content_type,
                           "application/cbor");
@@ -49,7 +49,7 @@
         }
         else
         {
-            // Technically prefered could also be NoMatch here, but we'd
+            // Technically preferred could also be NoMatch here, but we'd
             // like to default to something rather than return 400 for
             // backward compatibility.
             res.addHeader(boost::beast::http::field::content_type,