website: Update supported GCC version to 11

GCC-11 was added to the compiler tests here:
https://gem5-review.googlesource.com/c/public/gem5/+/50749

Change-Id: If88769238619a32ad067e09fc38e39d4bcb0b915
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/50767
Reviewed-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby R. Bruce <bbruce@ucdavis.edu>
diff --git a/_pages/documentation/general_docs/building/index.md b/_pages/documentation/general_docs/building/index.md
index d4cebda..89e8f29 100644
--- a/_pages/documentation/general_docs/building/index.md
+++ b/_pages/documentation/general_docs/building/index.md
@@ -38,7 +38,7 @@
 
 * **git** : gem5 uses git for version control.
 * **gcc**: gcc is used to compiled gem5. **Version >=7 must be used**. We
-support up to gcc Version 10.
+support up to gcc Version 11.
 * **Clang**: Clang can also be used. At present, we support Clang 6 to
 Clang 11 (inclusive).
 * **SCons** : gem5 uses SCons as its build environment. SCons 3.0 or greater
diff --git a/_pages/documentation/learning_gem5/part1/part1_1_building.md b/_pages/documentation/learning_gem5/part1/part1_1_building.md
index 0b5ca00..d59bd9b 100644
--- a/_pages/documentation/learning_gem5/part1/part1_1_building.md
+++ b/_pages/documentation/learning_gem5/part1/part1_1_building.md
@@ -47,7 +47,7 @@
         sudo apt install build-essential
         ```
 
-       **We support GCC Versions >=7, up to GCC 10**
+       **We support GCC Versions >=7, up to GCC 11**
 
 3.  [SCons 3.0+](http://www.scons.org/)
     :   gem5 uses SCons as its build environment. SCons is like make on