fix: tweak example for single retry strategy

Co-authored-by: Susa Tünker <74345218+sujaya-sys@users.noreply.github.com>

Author: pmallol

site/content/docs/cli/constructs-reference.md

@@ -1083,7 +1083,7 @@ new ApiCheck('retrying-check', {
 `RetryStrategyBuilder` supports the following helper methods:
 
 - `noRetries()`: No retries are performed.
-- `singleStrategy(options)`: A single retry is performed after a fixed interval, e.g. 5s and 5s.
+- `singleStrategy(options)`: A single retry is performed after a fixed interval, e.g. 5s
 - `fixedStrategy(options)`: A fixed time between retries, e.g. 5s, 5s, 5s etc.
 - `linearStrategy(options)`: A linearly increasing time between retries, e.g. 5s, 10s, 15s, etc.
 - `exponentialStrategy(options)`: An exponentially increasing time between retries, e.g. 5s, 25s, 125s (2m and 5s) etc.