fix(docs-infra): increase the opacity of background-color for inline `code` blocks (#42297)
fix(docs-infra): increase the opacity of background-color for inline `code` blocks (#42297)

I intentionally did not change the font size as discussed in #41196
because the current
font size is already about the same as the normal text size.

Fixes #41196

PR Close #42297

angular-indonesia/angular,brandonroberts/angular,manekinekko/angular,gnomeontherun/angular,mgechev/angular,ocombe/angular,angular/angular,gnomeontherun/angular,shairez/angular,shairez/angular,gnomeontherun/angular,ocombe/angular,manekinekko/angular,angular-indonesia/angular,manekinekko/angular,JiaLiPassion/angular,angular/angular,angular-indonesia/angular,ocombe/angular,mgechev/angular,mgechev/angular,angular/angular,JiaLiPassion/angular,brandonroberts/angular,mgechev/angular,mgechev/angular,angular-indonesia/angular,JiaLiPassion/angular,JiaLiPassion/angular,gkalpak/angular,angular/angular,brandonroberts/angular,brandonroberts/angular,shairez/angular,shairez/angular,gkalpak/angular,gnomeontherun/angular,gkalpak/angular,manekinekko/angular,manekinekko/angular,brandonroberts/angular,manekinekko/angular,ocombe/angular,brandonroberts/angular,gkalpak/angular,shairez/angular,ocombe/angular,ocombe/angular