build: fix mismatched config descriptions
diff --git a/pico_sdk_version.cmake b/pico_sdk_version.cmake
index 9bea169..5cbdd8f 100644
--- a/pico_sdk_version.cmake
+++ b/pico_sdk_version.cmake
@@ -8,7 +8,7 @@
# PICO_CONFIG: PICO_SDK_VERSION_REVISION, SDK version revision, type=int, pico_base
set(PICO_SDK_VERSION_REVISION 1)
# PICO_BUILD_DEFINE: PICO_SDK_VERSION_PRE_RELEASE_ID, optional SDK pre-release version identifier, type=string, pico_base
-# PICO_CONFIG: PICO_SDK_VERSION_PRE_RELEASE_ID, SDK version revision, type=string, pico_base
+# PICO_CONFIG: PICO_SDK_VERSION_PRE_RELEASE_ID, optional SDK pre-release version identifier, type=string, pico_base
set(PICO_SDK_VERSION_PRE_RELEASE_ID develop)
# PICO_BUILD_DEFINE: PICO_SDK_VERSION_STRING, SDK version, type=string, group=pico_base
