Fix two typos & clarify some wording (#147)

* Fix two typos

* Clarify a bit of wording

pages/index.vue

@@ -19,7 +19,7 @@
           We implemented <span>fast and adaptable</span> search algorithms so
           you don't have to wait, while creating a responsive interface that
           makes sense. Modrinth is full of elegant mod discovery and a platform
-          platform which just works.
+          which just works.
         </p>
       </div>
       <div class="right hero-image">

pages/report/create.vue

@@ -17,7 +17,8 @@
         <label>
           <span>
             The ID of the item you are reporting. For example, the item ID of a
-            mod would be it's mod ID.
+            mod would be its mod ID, found on the right side of that mod's page
+            under "Project ID".
           </span>
           <input v-model="itemId" type="text" placeholder="Enter the Item ID" />
         </label>