Fix completionItem/resovle test not waiting for resolution

Author: krassowski

atest/05_Features/Completion.robot

@@ -289,4 +289,4 @@ Trigger Completer
 Completer Should Include Documentation
     [Arguments]    ${text}
     Wait Until Page Contains Element    ${DOCUMENTATION_PANEL}    timeout=10s
-    Element Should Contain    ${DOCUMENTATION_PANEL}    ${text}
+    Wait Until Keyword Succeeds    10 x    1 s    Element Should Contain    ${DOCUMENTATION_PANEL}    ${text}