mssql: typos in help sections

Fixes #11455

public/app/plugins/datasource/mssql/partials/annotations.editor.html

@@ -28,7 +28,7 @@ An annotation is an event that is overlayed on top of graphs. The query can have
 Macros:
 - $__time(column) -> column AS time
 - $__timeEpoch(column) -> DATEDIFF(second, '1970-01-01', column) AS time
-- $__timeFilter(column) -> column >= DATEADD(s, 18446744066914186738, '1970-01-01') AND column &t;= DATEADD(s, 18446744066914187038, '1970-01-01')
+- $__timeFilter(column) -> column >= DATEADD(s, 18446744066914186738, '1970-01-01') AND column <= DATEADD(s, 18446744066914187038, '1970-01-01')
 - $__unixEpochFilter(column) -> column >= 1492750877 AND column <= 1492750877
 
 Or build your own conditionals using these macros which just return the values:

public/app/plugins/datasource/mssql/partials/query.editor.html

@@ -49,7 +49,7 @@ Table:
 Macros:
 - $__time(column) -> column AS time
 - $__timeEpoch(column) -> DATEDIFF(second, '1970-01-01', column) AS time
-- $__timeFilter(column) -> column >= DATEADD(s, 18446744066914186738, '1970-01-01') AND column &t;= DATEADD(s, 18446744066914187038, '1970-01-01')
+- $__timeFilter(column) -> column >= DATEADD(s, 18446744066914186738, '1970-01-01') AND column <= DATEADD(s, 18446744066914187038, '1970-01-01')
 - $__unixEpochFilter(column) -> column >= 1492750877 AND column <= 1492750877
 - $__timeGroup(column, '5m'[, fillvalue]) -&gt; CAST(ROUND(DATEDIFF(second, '1970-01-01', column)/300.0, 0) as bigint)*300. Providing a <i>fillValue</i> of <i>NULL</i> or floating value will automatically fill empty series in timerange with that value.