[lld][WebAssembly] Feedback from D92038. NFC

Differential Revision: https://reviews.llvm.org/D92429

lld/test/wasm/weak-undefined-pic.s

@@ -27,7 +27,7 @@ _start:
 .weak foo
 .functype foo () -> (i32)
 
-# Verify that we do not generate dynamnic relocations for the GOT entry.
+# Verify that we do not generate dynamic relocations for the GOT entry.
 
 # CHECK-NOT: __wasm_apply_relocs
 
@@ -68,7 +68,7 @@ _start:
 # CHECK-NEXT:      - Index:           1
 # CHECK-NEXT:        Name:            'undefined_weak:foo'
 
-# With `-pie` or `-shared` the resolution should is defered to the dynamic
+# With `-pie` or `-shared` the resolution should be deferred to the dynamic
 # linker and the function address should be imported as GOT.func.foo.
 #
 # RUN: wasm-ld --experimental-pic -pie %t.o -o %t3.wasm

lld/wasm/Symbols.h

@@ -160,6 +160,9 @@ public:
   // True if this symbol is a linker-synthesized stub function (traps when
   // called) and should otherwise be treated as missing/undefined.  See
   // SymbolTable::replaceWithUndefined.
+  // These stubs never appear in the table and any table index relocations
+  // against them will produce address 0 (The table index representing
+  // the null function pointer).
   bool isStub : 1;
 
   uint32_t flags;