README.md: Fix MD040 warnings

The following warnings are generated by using markdownlint analysis:
```
MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
```
Refer to markdown-lint [1] to fix MD040
[1]: https://github.com/updownpress/markdown-lint/blob/master/rules/040-fenced-code-language.md

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I8bbe4c5b1484f526a917836cc6c215e9b3789c31
diff --git a/README.md b/README.md
index c35a373..7e1e9e0 100644
--- a/README.md
+++ b/README.md
@@ -4,15 +4,14 @@
 
 ## To Build
 
-```
 To build this package, do the following steps:
 
     1. meson builddir
     2. ninja -C builddir
 
 To build with phal feature:
+
     1. meson builddir -Dphal=enabled -Dopenfsi=enabled
     2. ninja -C builddir
 
 To clean the repository run `ninja -C builddir/ clean`.
-```