How to change the default version of gcc man page?

I have installed gcc-4.8 and gcc-6. The default gcc version is gcc-4.8, but I want to change the default gcc version to gcc-6, so I do the following:

$ sudo update-alternatives --remove-all gcc
$ sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 10
$ sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 20

then the default gcc version has changed to gcc-6, but when I run command

$ man gcc

the man page version of gcc is still gcc-4.8. How can I change the man page version of gcc to gcc-6? Thanks!
Sorry for my bad English.

Solution

I have found the solution:

Find the location of gcc-6 man page:

$ locate gcc-6 | grep 'man'             
/usr/share/man/man1/gcc-6.1.gz            
/usr/share/man/man1/x86_64-linux-gnu-gcc-6.1.gz

so the location of gcc-6 man page is /usr/share/man/man1/gcc-6.1.gz

Remove the file /usr/share/man/man1/gcc.1.gz if it exist:
```
$ sudo rm /usr/share/man/man1/gcc.1.gz 
```

Create a symbolic link to /usr/share/man/man1/gcc-6.1.gz:

$ sudo ln -s /usr/share/man/man1/gcc-6.1.gz /usr/share/man/man1/gcc.1.gz

Then run comman:

$ man gcc

You will see the man page version of gcc has changed to gcc-6.
Sorry for my English.