Fix comments which refer to jenkins. (#1981)

* Fix comments which refer to jenkins.

* Spelling

Co-Authored-By: turt2live <travpc@gmail.com>

scripts/test-and-build.sh

@@ -30,5 +30,5 @@ go get gopkg.in/fsnotify/fsnotify.v1
 
 # build the spec for matrix.org.
 # (we don't actually use it on travis, but it's still useful to check we
-# can build it. On Jenkins, this is then used to deploy to matrix.org).
+# can build it. On Buildkite, this is then used to deploy to matrix.org).
 ./scripts/generate-matrix-org-assets

specification/proposals.rst

@@ -1,6 +1,6 @@
 Tables of Tracked Proposals
 ---------------------------
 
-This file is autogenerated by a jenkins build process
+This file is generated by an automated process on our build server.
 
-View the current live version `at https://matrix.org/docs/spec/proposals <https://matrix.org/docs/spec/proposals>`_
+View the current live version `at https://matrix.org/docs/spec/proposals <https://matrix.org/docs/spec/proposals>`_.