ReceiveCommits: Change "can not" to "cannot" in error messages

Change-Id: Iac725169888d35fe416bba05c3bc2b82fff2b9f0
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/git/ReceiveCommits.java b/gerrit-server/src/main/java/com/google/gerrit/server/git/ReceiveCommits.java
index 6a6f908..5f1d046 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/git/ReceiveCommits.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/git/ReceiveCommits.java
@@ -888,7 +888,7 @@
         reject(cmd, "cannot delete project configuration");
       } else {
         errors.put(Error.DELETE, ctl.getRefName());
-        reject(cmd, "can not delete references");
+        reject(cmd, "cannot delete references");
       }
     }
   }
@@ -987,7 +987,7 @@
     destBranchCtl = projectControl.controlForRef(destBranch);
     if (!destBranchCtl.canUpload()) {
       errors.put(Error.CODE_REVIEW, cmd.getRefName());
-      reject(cmd, "can not upload review");
+      reject(cmd, "cannot upload review");
       return;
     }