Merge #11960: [Doc] Fix link to installation script

3d3e58e [Doc] Fix link to installation script (laudaa)

Pull request description:

  While trying to set up a fresh build by following the Doc, I've noticed that the scripts to the installation script are broken. They try to go to:
  https://github.com/bitcoin/bitcoin/blob/master/doc/contrib/install_db4.sh, but should go to:
  https://github.com/bitcoin/bitcoin/blob/master/contrib/install_db4.sh

Tree-SHA512: db7df9dbfdd946c6edc07e10b6717cbb82083f974f11765dc2b6942d20d1569f54bf63da34cf29ee12ba2217e342574d382e4dc61ee2d2617f40e87b538ab76a

Author: laanwj

doc/build-osx.md

@@ -29,7 +29,7 @@ NOTE: Building with Qt4 is still supported, however, could result in a broken UI
 Berkeley DB
 -----------
 It is recommended to use Berkeley DB 4.8. If you have to build it yourself,
-you can use [the installation script included in contrib/](contrib/install_db4.sh)
+you can use [the installation script included in contrib/](/contrib/install_db4.sh)
 like so
 
 ```shell

doc/build-unix.md

@@ -166,7 +166,7 @@ turned off by default.  See the configure options for upnp behavior desired:
 Berkeley DB
 -----------
 It is recommended to use Berkeley DB 4.8. If you have to build it yourself,
-you can use [the installation script included in contrib/](contrib/install_db4.sh)
+you can use [the installation script included in contrib/](/contrib/install_db4.sh)
 like so
 
 ```shell