Fix links to sources for 2.9.0

[svekars]

Ran:

if [ "$1" == "" ]; then
  echo "Incorrect usage. Correct Usage: replace_github_links.sh <directory>"
  exit 1
fi

find $1 -name "*.html" -print0 | xargs -0 sed -i 's|github.com/pytorch/pytorch/blob/v2.9.1|github.com/pytorch/pytorch/blob/v2.9.0|g'

echo "Replaced v2.9.1 with v2.9.0 in GitHub links in $1 directory"

[atalman]

lgtm. Thank you @svekars