docs: use their instead of her/his (#7865)

Signed-off-by: Superchupu <[email protected]>

Author: SuperchupuDev

apps/site/pages/en/learn/modules/publishing-a-package.mdx

@@ -522,7 +522,7 @@ The `"engines"` field provides both a human-friendly and a machine-friendly indi
 
 Specifically in relation to Node.js, there are 4 problems to solve:
 
-- Determining format of source code files (author running her/his own code)
+- Determining format of source code files (author running their own code)
 - Determining format of distribution files (code consumers will receive)
 
 - Publicising distribution code for when it is `require()`’d (consumer expects CJS)