Minor typos and wording in type-layout

Author: Havvy

src/glossary.md

@@ -86,7 +86,7 @@ array with that item type.
 
 It is a multiple of the alignment, including zero. The size can change
 depending on compiler version (as new optimizations are made) and target
-platform (as `usize` varies).
+platform (similar to how `usize` varies per-platform).
 
 [More][alignment].
 

src/items/enumerations.md

@@ -124,7 +124,7 @@ enum OverflowingDiscriminantError2 {
 
 ## Zero-variant Enums
 
-Enums with zero variants are known as *zero-variant enumss*. As they have
+Enums with zero variants are known as *zero-variant enums*. As they have
 no valid values, they cannot be instantiated.
 
 ```rust

src/type-layout.md

@@ -188,7 +188,7 @@ for field in struct.fields_in_declaration_order() {
 struct.size = current_offset + current_offset % struct.alignment;
 ```
 
-> Note: You can have zero-sized structs from this algorithm. This differs from
+> Note: This algorithm can produce zero-sized structs. This differs from
 > C where structs without data still have a size of one byte.
 
 #### \#[repr(C)] Unions