Fix MD036 warnings

The following warnings are generated by using markdownlint analysis:
```
ipmi_flash.md:102 MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "The update has completed (opti..."]
```
Refer to markdown-lint [1] to fix MD036
[1]: https://github.com/updownpress/markdown-lint/blob/master/rules/036-no-emphasis-as-header.md

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: Ida1d859fcf85ba38ac8e823bb4d57d5e56e4e753
diff --git a/ipmi_flash.md b/ipmi_flash.md
index fd9ed99..ddf56ff 100644
--- a/ipmi_flash.md
+++ b/ipmi_flash.md
@@ -99,7 +99,7 @@
 
 ### `updatedCompleted`
 
-**The update has completed (optional state to reach)**
+**The update has completed (optional state to reach).**
 
 ## Expected State Transition Sequence