Fourteen years later, Britney Spears is finally getting what she wanted. The pop sensation unveiled an a capella version of her hit song “Baby One More Time,” with some explicit lyric changes on Instagram Friday. She sang out in the video, “Give me a f—ing sign, hit me baby one more time.” “Well I have asked for what I wanted for 14 years… a different version of ‘Baby,’” she wrote in the caption. “I haven’t shared my voice in an extremely long time… maybe too long.” Fans praised Spears for the video with comments like “THE MOMENT EVERYONE WAS WAITING FOR!” and “my queen,” filling the section. …