Use ISO 639-1 code for examples

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

content/en/content-management/cross-references.md

@@ -42,7 +42,7 @@ You will get an error if you document could not be uniquely resolved. The error
 Link to another language version of a document, you need to use this syntax:
 
 ```go-html-template
-{{</* relref path="document.md" lang="jp" */>}}
+{{</* relref path="document.md" lang="ja" */>}}
 ```
 
 ### Get another Output Format

content/en/content-management/multilingual.md

@@ -67,7 +67,7 @@ Only the obvious non-global options can be overridden per language. Examples of
 You can disable one or more languages. This can be useful when working on a new translation.
 
 ```toml
-disableLanguages = ["fr", "jp"]
+disableLanguages = ["fr", "ja"]
 ```
 
 Note that you cannot disable the default content language.
@@ -75,7 +75,7 @@ Note that you cannot disable the default content language.
 We kept this as a standalone setting to make it easier to set via [OS environment](/getting-started/configuration/#configure-with-environment-variables):
 
 ```bash
-HUGO_DISABLELANGUAGES="fr jp" hugo
+HUGO_DISABLELANGUAGES="fr ja" hugo
 ```
 If you have already a list of disabled languages in `config.toml`, you can enable them in development like this:
 

content/en/news/0.45-relnotes/index.md

@@ -39,7 +39,7 @@ You can also use the `..` to refer to a page one level up etc.:
 We have now also added language support to `ref` and `relref`, so you can link to a page in another language:
 
 ```go-html-template
-{{</* relref path="document.md" lang="jp" */>}}
+{{</* relref path="document.md" lang="ja" */>}}
 ```
 
 To link to a given Output Format of a document, you can use this syntax: