chore: fix some comments (#2798)

Signed-off-by: shandongbinzhou <shandongbinzhou@outlook.com>
Co-authored-by: shandongbinzhou <shandongbinzhou@outlook.com>

Author: Sun Bin

bindgen-tests/tests/expectations/tests/enum-doc-bitfield.rs

@@ -2,14 +2,14 @@
 enum B {
     /// Document field with three slashes
     VAR_A = 0,
-    /** Document field with preceeding star */
+    /** Document field with preceding star */
     VAR_B = 1,
-    /*! Document field with preceeding exclamation */
+    /*! Document field with preceding exclamation */
     VAR_C = 2,
     VAR_D = 3, /**< Document field with following star */
     VAR_E = 4, /*!< Document field with following exclamation */
     /**
-     * Document field with preceeding star, with a loong long multiline
+     * Document field with preceding star, with a loong long multiline
      * comment.
      *
      * Very interesting documentation, definitely.

bindgen-tests/tests/expectations/tests/enum-doc-mod.rs

@@ -6,7 +6,7 @@ struct AlignedToOne {
     int i;
 } __attribute__ ((packed,aligned(1)));
 
-/// This should be be packed because Rust 1.33 has `#[repr(packed(N))]`.
+/// This should be packed because Rust 1.33 has `#[repr(packed(N))]`.
 struct AlignedToTwo {
     int i;
 } __attribute__ ((packed,aligned(2)));
@@ -25,7 +25,7 @@ struct PackedToOne {
 
 #pragma pack(2)
 
-/// This should be be packed because Rust 1.33 has `#[repr(packed(N))]`.
+/// This should be packed because Rust 1.33 has `#[repr(packed(N))]`.
 struct PackedToTwo {
     int x;
     int y;

bindgen-tests/tests/expectations/tests/enum-doc-rusty.rs

@@ -6,5 +6,5 @@ class DoesNotUseU {
     V v;
 };
 
-// The bool should go away becuase U is not used.
+// The bool should go away because U is not used.
 using Alias = DoesNotUseU<int, bool, char>;

bindgen-tests/tests/expectations/tests/enum-doc.rs

@@ -1,7 +1,7 @@
 // bindgen-flags: --experimental --wrap-static-fns
 // bindgen-parse-callbacks: wrap-as-variadic-fn
 
-// to avoid poluting theexpectation tests we put the stdarg.h behind a conditional
+// to avoid polluting the expectation tests we put the stdarg.h behind a conditional
 // variable only used in bindgen-integration
 #ifdef USE_VA_HEADER
 #include <stdarg.h>

bindgen-tests/tests/expectations/tests/issue-537-repr-packed-n.rs

@@ -2557,7 +2557,7 @@ impl CodeGenerator for CompInfo {
             };
             // Note we use `ptr::write_bytes()` instead of `mem::zeroed()` because the latter does
             // not necessarily ensure padding bytes are zeroed. Some C libraries are sensitive to
-            // non-zero padding bytes, especially when forwards/backwards compatability is
+            // non-zero padding bytes, especially when forwards/backwards compatibility is
             // involved.
             result.push(quote! {
                 impl #generics Default for #ty_for_impl {