ubuntu-test: Remove some ancient/incorrect/useless comments.

Author: jamadden

ubuntu-test

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # This needs to be run from the root of the project.
-# To update: docker pull quay.io/pypa/manylinux2010_x86_64
+
 set -e
 export PYTHONUNBUFFERED=1
 export PYTHONDONTWRITEBYTECODE=1
@@ -15,10 +15,7 @@ export PIP_NO_WARN_SCRIPT_LOCATION=1
 if [ -d /greenlet ]; then
     # Running inside docker
     export GREENLET_MANYLINUX=1
-    # Build for speed (we're going to test this anyway) and without assertions.
-    # Note: -Ofast includes -ffast-math which affects process-wide floating-point flags (e.g. can affect numpy).
-    # It may also violate standards compliance in a few ways. Rather than opt-out with -fno-fast-math,
-    # we use O3, which has neither of those problems.
+    # Our setup.py overrides this with -Os; be sure it does.
     export CFLAGS="-O3 -DNDEBUG -Wall"
 
     apt-get update