fix(docs): lot of misspelling (#1180) [skip ci]

source/app/web/statics/index.html

@@ -76,7 +76,7 @@
             <div class="about">
               <small class="warning mb1" v-if="preview">
                 Metrics are rendered by <a href="https://metrics.lecoq.io/">metrics.lecoq.io</a> in preview mode.<br>
-                Any backend editions won't be reflected but client-side rendering can still be tested.
+                Any backend changes won't be reflected but client-side rendering can still be tested.
               </small>
               <div class="warning mb1" v-if="(!requests.rest.remaining)||(!requests.graphql.remaining)">
                 This web instance has run out of GitHub API requests.