Improve some comments, while reading/debugging the code

Author: dfaure-kdab

internal/compiler/expression_tree.rs

@@ -586,7 +586,7 @@ pub enum MinMaxOp {
     Max,
 }
 
-/// The Expression is hold by properties, so it should not hold any strong references to node from the object_tree
+/// The Expression is held by properties, so it should not hold any strong references to node from the object_tree
 #[derive(Debug, Clone, Default)]
 pub enum Expression {
     /// Something went wrong (and an error will be reported)

internal/compiler/passes/lower_layout.rs

@@ -131,6 +131,7 @@ fn lower_element_layout(
     let prev_base = std::mem::replace(&mut elem.base_type, type_register.empty_type());
     elem.default_fill_parent = (true, true);
     // Create fake properties for the layout properties
+    // like alignment, spacing, spacing-horizontal, spacing-vertical
     for (p, ty) in prev_base.property_list() {
         if !elem.base_type.lookup_property(&p).is_valid()
             && !elem.property_declarations.contains_key(&p)

internal/core/layout.rs

@@ -681,7 +681,7 @@ pub fn reorder_dialog_button_layout(cells: &mut [GridLayoutCellData], roles: &[D
 
     #[cfg(feature = "std")]
     fn is_kde() -> bool {
-        // assume some unix check if XDG_CURRENT_DESKTOP stats with K
+        // assume some Unix, check if XDG_CURRENT_DESKTOP starts with K
         std::env::var("XDG_CURRENT_DESKTOP")
             .ok()
             .and_then(|v| v.as_bytes().first().copied())

tools/lsp/preview/properties.rs

@@ -97,7 +97,8 @@ pub struct QueryPropertyResponse {
 const HIGH_PRIORITY: u32 = 100;
 const DEFAULT_PRIORITY: u32 = 1000;
 
-// This gets defined accessibility properties...
+// This returns defined reserved properties such as x, y, width, height,
+// accessiblity properties or layout properties
 fn get_reserved_properties<'a>(
     group: &'a str,
     group_priority: u32,