Minor cleanup and documentation.

src/Magnum/AbstractTexture.cpp

@@ -235,8 +235,7 @@ AbstractTexture::~AbstractTexture() {
     if(!_id || !(_flags & ObjectFlag::DeleteOnDestruction)) return;
 
     /* Remove all bindings */
-    for(auto& binding: Context::current().state().texture->bindings)
+    for(auto& binding: Context::current().state().texture->bindings) {
-    {
         /* MSVC 2015 needs the parentheses around */
         if(binding.second == _id) binding = {};
     }

src/Magnum/Implementation/TextureState.h

@@ -142,6 +142,7 @@ struct TextureState {
 
     Containers::Array<std::pair<GLenum, GLuint>> bindings;
     #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
+    /* Texture object ID, level, layered, layer, access */
     Containers::Array<std::tuple<GLuint, GLint, GLboolean, GLint, GLenum>> imageBindings;
     #endif
 };