Fix WASM format link (mdn#27925)

* Update index.md

* Update files/en-us/webassembly/understanding_the_text_format/index.md

* Update files/en-us/webassembly/understanding_the_text_format/index.md

Co-authored-by: Joshua Chen <sidachen2003@gmail.com>

* Update files/en-us/webassembly/understanding_the_text_format/index.md

Co-authored-by: Hamish Willee <hamishwillee@gmail.com>

---------

Co-authored-by: Joshua Chen <sidachen2003@gmail.com>
Co-authored-by: Hamish Willee <hamishwillee@gmail.com>

files/en-us/webassembly/understanding_the_text_format/index.md

@@ -31,7 +31,7 @@ Let's start with the simplest, shortest possible Wasm module.
 
 This module is totally empty, but is still a valid module.
 
-If we convert our module to binary now (see [Converting WebAssembly text format to Wasm](/en-US/docs/WebAssembly/Text_format_to_Wasm)), we'll see just the 8 byte module header described in the [binary format](https://webassembly.github.io/spec/core/binary/index.html#high-level-structure):
+If we convert our module to binary now (see [Converting WebAssembly text format to Wasm](/en-US/docs/WebAssembly/Text_format_to_Wasm)), we'll see just the 8 byte module header described in the [binary format](https://webassembly.github.io/spec/core/binary/modules.html#binary-module):
 
 ```wasm
 0000000: 0061 736d              ; WASM_BINARY_MAGIC