doc: Increase the free storage requirement for building to 65 GBytes

Issue-Id: SCM-3318
Signed-off-by: Diego Sueiro <diego.sueiro@arm.com>
Change-Id: I569e5ed1d3dffa482b167a3b6c6aaa3cb4aa228f

documentation/changelog.rst

@@ -24,6 +24,7 @@ Documentation:
   * Refactored Layer Dependencies on README.md
   * Added Gitlab Pages integration via .gitlab-ci.yml
   * Updated kas installation instructions
+  * Increased the free storage requirement for building to 65 GBytes
 
 Limitations
 ===========

documentation/quickstart.rst

@@ -37,7 +37,7 @@ For more details on kas, see `kas Introduction`_.
 .. _kas Introduction: https://kas.readthedocs.io/en/latest/intro.html
 
 .. note::
-  The Build Host machine should have at least 50 GBytes of free disk space for
+  The Build Host machine should have at least 65 GBytes of free disk space for
   the next steps to work correctly.
 
 Build configuration YAML files can then be built via kas by running: