[XS] Change in coreboot[main]: Documentation/external_docs.md: Add link to EGS paper

[David Hendricks (Code Review)]

David Hendricks has submitted this change. ( https://review.coreboot.org/c/coreboot/+/78117?usp=email )

Change subject: Documentation/external_docs.md: Add link to EGS paper
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Documentation/external_docs.md: Add link to EGS paper

Intel published a technical paper about coreboot on Eagle Stream.
The document number is 778593.

Signed-off-by: David Hendricks 
Change-Id: Ic67f9a69b7e2ea526c3c5a604e38bb939c72feec
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78117
Tested-by: build bot (Jenkins) 
Reviewed-by: Felix Singer 
---
M Documentation/external_docs.md
1 file changed, 1 insertion(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Felix Singer: Looks good to me, approved

diff --git a/Documentation/external_docs.md b/Documentation/external_docs.md
index 2f34bf6..b5ee908 100644
--- a/Documentation/external_docs.md
+++ b/Documentation/external_docs.md
@@ -113,6 +113,7 @@
   * [Resource & Documentation Center](https://www.intel.com/content/www/us/en/resources-documentation/developer.ht...)
   * [Architecture Software Developer Manuals](https://www.intel.com/content/www/us/en/developer/articles/technical/intel-s...)
   * [Intel specific ACPI](https://www.intel.com/content/www/us/en/standards/processor-vendor-specific-...)
+  * [coreboot on Eagle Stream](https://www.intel.com/content/www/us/en/content-details/778593/coreboot-prac...)

* Rockchip
   * [Open Source Wiki](https://opensource.rock-chips.com/wiki_Main_Page)