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GH-39416: [GLib][Docs] Fixed Broken Link in README Content  (#39896)



### Rationale for this change

### What changes are included in this PR?
 Fixed Broken Link in README Content 

### Are these changes tested?
Yes

### Are there any user-facing changes?
Yes

* Closes: #39416

Lead-authored-by: Divyansh200102 <divyanshkhatri200102@gmail.com>
Co-authored-by: Divyansh200102 <146909065+Divyansh200102@users.noreply.github.com>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>