docs: update Vale installation instructions (#47031)
docs: update Vale installation instructions (#47031)

This update includes:
* installation directions for the current version of the Vale VSCode extension (v. 0.15.0)
* a workaround for if the current version of the extension doesn't work.

PR Close #47031

angular/angular,gkalpak/angular,angular/angular,angular-indonesia/angular,gkalpak/angular,JiaLiPassion/angular,angular-indonesia/angular,angular/angular,gkalpak/angular,angular-indonesia/angular,JiaLiPassion/angular,gkalpak/angular,gnomeontherun/angular,gnomeontherun/angular,angular-indonesia/angular,gnomeontherun/angular,gnomeontherun/angular,JiaLiPassion/angular,angular/angular,JiaLiPassion/angular