[PATCH] tracing: fix warnings when building htmldocs

[Donglin Peng]

When building htmldocs, the following warnings appear:

Documentation/trace/ftrace.rst:2797: WARNING: Literal block expected; none found.
Documentation/trace/ftrace.rst:2816: WARNING: Literal block expected; none found.

So fix it.

Signed-off-by: Donglin Peng <pengdonglin@xxxxxxxxxxxxxx>
---
 Documentation/trace/ftrace.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst
index df2d3e57a83f..172f35c7308f 100644
--- a/Documentation/trace/ftrace.rst
+++ b/Documentation/trace/ftrace.rst
@@ -2786,7 +2786,7 @@ option, and these limitations will be eliminated in the future:
   especially when larger types are truncated, whether explicitly or implicitly.
   Here are some specific cases to illustrate this point:
 
-  **Case One**::
+  **Case One**:
 
   The function narrow_to_u8 is defined as follows::
 
@@ -2805,7 +2805,7 @@ option, and these limitations will be eliminated in the future:
   If you pass 0x123456789abcdef to this function and want to narrow it,
   it may be recorded as 0x123456789abcdef instead of 0xef.
 
-  **Case Two**::
+  **Case Two**:
 
   The function error_if_not_4g_aligned is defined as follows::
 
-- 
2.40.1