fix(renderers): correct Bootstrap class for dropdown navigation

This class not being set correctly may cause odd rendering artifacts in
the documentation.

Author: bauglir

src/renderers.jl

@@ -37,7 +37,7 @@ end
 
 function render(doc::DropdownNav, dir, thispagepath, prettyurls)
     return @htl """
-    <div class="nav-dropown">
+    <div class="nav-dropdown">
         <button class="nav-item dropdown-label">$(doc.name)</button>
         <ul class="nav-dropdown-container">
             $([render(doc, dir, thispagepath, prettyurls) for doc in doc.children])
@@ -48,7 +48,7 @@ end
 
 function render(doc::MegaDropdownNav, dir, thispagepath, prettyurls)
     return @htl """
-    <div class="nav-dropown">
+    <div class="nav-dropdown">
         <button class="nav-item dropdown-label">$(doc.name)</button>
         <div class="nav-dropdown-container nav-mega-dropdown-container">
             $([render(doc, dir, thispagepath, prettyurls) for doc in doc.columns])