Update sycl/doc/design/KernelProgramCache.md

Co-authored-by: Marcos Maronas <[email protected]>

Author: uditagarwal97

sycl/doc/design/KernelProgramCache.md

@@ -180,7 +180,7 @@ The following environment variables affect the cache behavior:
 | Environment variable | Values | Description |
 | -------------------- | ------ | ----------- |
 | `SYCL_CACHE_DIR` | Path | Path to persistent cache root directory. Default values are `%AppData%\libsycl_cache` for Windows and `$XDG_CACHE_HOME/libsycl_cache` on Linux, if `XDG_CACHE_HOME` is not set then `$HOME/.cache/libsycl_cache`. When none of the environment variables are set SYCL persistent cache is disabled. |
-| `SYCL_CACHE_PERSISTENT` | Integer | Controls persistent device compiled code cache. Turns it on if set to '1' and turns it off if set to '0'. When cache is enabled SYCL runtime will try to cache and reuse JIT-compiled binaries. Default is off. |
+| `SYCL_CACHE_PERSISTENT` | '1' or '0' | Controls persistent device compiled code cache. Turns it on if set to '1' and turns it off if set to '0'. When cache is enabled SYCL runtime will try to cache and reuse JIT-compiled binaries. Default is off. |
 | `SYCL_CACHE_IN_MEM` | '1' or '0' | Enable ('1') or disable ('0') in-memory caching of device compiled code. When cache is enabled SYCL runtime will try to cache and reuse JIT-compiled binaries. Default is '1'. |
 | `SYCL_IN_MEM_CACHE_EVICTION_THRESHOLD` | Positive integer  | `SYCL_IN_MEM_CACHE_EVICTION_THRESHOLD` accepts an integer that specifies the maximum size of the in-memory program cache in bytes. Eviction is performed when the cache size exceeds the threshold. The default value is 0 which means that eviction is disabled.  |
 | `SYCL_CACHE_EVICTION_DISABLE` | Any(\*) | Switches persistent cache eviction off when the variable is set. |