[Patch] Build spec: Add DSC DEFAULT as optional line in Global PCD Section

[Yonghong Zhu <yonghong.zhu@intel.com>]

Because of the PCD value may override by build option, so current build
report also display the DSC DEFAULT value.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Kevin W Shaw <kevin.w.shaw@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
---
 13_build_reports/136_global_pcd_section.md | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/13_build_reports/136_global_pcd_section.md b/13_build_reports/136_global_pcd_section.md
index c300920..a9661b6 100644
--- a/13_build_reports/136_global_pcd_section.md
+++ b/13_build_reports/136_global_pcd_section.md
@@ -106,11 +106,16 @@ gTokenSpaceGuid
                   0x0001FFF
 ```
 
 #### 13.6.2.2 Default (optional) line
 
-The second optional line is present if the value from the DEC was overridden.
+The second optional line is present if the value from the DSC was overridden
+by build option. It is formatted as follows:
+
+`DSC DEFAULT = <Value in PCD SectionSection in DSC>`
+
+The third optional line is present if the value from the DEC was overridden.
 It is formatted as follows:
 
 `DEC DEFAULT = <Value in DEC>`
 
 #### Example
-- 
2.6.1.windows.1