build: require boost >= 1.71.0

Refs: #5276
Change-Id: I6eaae86beb89e00adf3891deb87816a1f176fdd6
diff --git a/docs/beginners-guide.rst b/docs/beginners-guide.rst
index e6006a5..0813a10 100644
--- a/docs/beginners-guide.rst
+++ b/docs/beginners-guide.rst
@@ -100,7 +100,7 @@
        $ dnf list --installed gcc
        $ dnf list --installed gcc-c++
 
-#. Python version 3.6 or later
+#. Python version 3.8 or later
 
    ::
 
@@ -124,7 +124,7 @@
 
        $ dnf list --installed pkgconf*
 
-#. Boost libraries version 1.65.1 or later
+#. Boost libraries version 1.71.0 or later
 
    ::