Correct SystemMemoryFull alerts summary

Change-Id: I37ea0120b122e777e70848e96ca4fac0763b6afd
Related-bug: PROD-35235
diff --git a/linux/meta/prometheus.yml b/linux/meta/prometheus.yml
index 47abd64..aa64932 100644
--- a/linux/meta/prometheus.yml
+++ b/linux/meta/prometheus.yml
@@ -134,7 +134,7 @@
         severity: warning
         service: system
       annotations:
-        summary: "More than 90% of memory is used or less than 8 GB of memory is available"
+        summary: "More than 90% of memory is used and less than 8 GB of memory is available"
         description: "The {{ $labels.host }} node uses {{ $value }}% of memory for 2 minutes."
     SystemMemoryFullMajor:
       if: >-
@@ -144,7 +144,7 @@
         severity: major
         service: system
       annotations:
-        summary: "More than 95% of memory is used or less than 4 GB of memory is available"
+        summary: "More than 95% of memory is used and less than 4 GB of memory is available"
         description: "The {{ $labels.host }} node uses {{ $value }}% of memory for 2 minutes."
     SystemRxPacketsDroppedTooHigh:
     {%- endraw %}