bitbake-user-manual: add BBLAYERS_FETCH_DIR

Add BBLAYERS_FETCH_DIR to the Variables Glossary.

Signed-off-by Trevor Woerner <[email protected]>

---
  .../bitbake-user-manual-ref-variables.xml                   | 13 +++++++++++++
  1 file changed, 13 insertions(+)

doc/bitbake-user-manual/bitbake-user-manual-ref-variables.xml +13 -0

index 86bf30b..bdbf421 100644
@@ -1016,6 +1016,19 @@
              </glossdef>
          </glossentry>
 
+        <glossentry id='var-BBLAYERS_FETCH_DIR'><glossterm>BBLAYERS_FETCH_DIR</glossterm>
+            <glossdef>
+                <para>
+                    Sets the base location where the layers are stored. By
+                    default this is set to <filename>${COREBASE}</filename>.
+                    This is used in conjunction with <filename>bitbake-layers
+                    layerindex-fetch</filename> and tells
+                    <filename>bitbake-layers</filename> where to place the
+                    fetched layer(s).
+                </para>
+            </glossdef>
+        </glossentry>
+
          <glossentry id='var-BBMASK'><glossterm>BBMASK</glossterm>
              <glossdef>
                  <para>