docs: point to renamed BB_BASEHASH_IGNORE_VARS variable

Since commit 98b3ed1b2e "meta/scripts: Handle bitbake variable
renaming", the new name of the variable is BB_BASEHASH_IGNORE_VARS
so let's update it so that Sphinx can resolve the Bitbake reference.

Cc: Quentin Schulz <foss+yocto@0leil.net>
(From yocto-docs rev: a6c6283e9cc30ca580f1719d8e22fca5f79c1e50)

Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/dev-manual/common-tasks.rst

@@ -9474,7 +9474,7 @@ BitBake has determined by doing the following:
 
    The output of ``bitbake-dumpsig`` also includes the value each
    variable had, a list of dependencies for each variable, and
-   :term:`BB_HASHBASE_WHITELIST`
+   :term:`BB_BASEHASH_IGNORE_VARS`
    information.
 
 There is also a ``bitbake-diffsigs`` command for comparing two

documentation/ref-manual/variables.rst

@@ -763,7 +763,7 @@ system and gives an overview of their function and contents.
 
          export BBSERVER=localhost:$port
 
-      By default, :term:`BBSERVER` also appears in :term:`BB_HASHBASE_WHITELIST`.
+      By default, :term:`BBSERVER` also appears in :term:`BB_BASEHASH_IGNORE_VARS`.
       Consequently, :term:`BBSERVER` is excluded from checksum and dependency
       data.