Add a comment for escape-svg function
Add a comment for escape-svg function

 Closes #30835 by leaving a comment in the source that the escape-svg() function must have quotes around data URIs.

GerHobbelt/bootstrap,inway/bootstrap,coliff/bootstrap,m5o/bootstrap,twbs/bootstrap,GerHobbelt/bootstrap,tjkohli/bootstrap,tjkohli/bootstrap,m5o/bootstrap,coliff/bootstrap,GerHobbelt/bootstrap,twbs/bootstrap,inway/bootstrap,inway/bootstrap