Modify code style.

Author: Abosite

docs/api_guides/low_level/program.rst

@@ -23,7 +23,7 @@ Program
 Block
 =========
 
-:code:`Block` 是高级语言中变量作用域的概念，类似C语言或Java语言中的一对大括号，其中包含局部变量定义和一系列指令或操作符.
+:code:`Block` 是高级语言中变量作用域的概念，类似 C 语言或 Java 语言中的一对大括号，其中包含局部变量定义和一系列指令或操作符.
 
 :code:`Block` 是计算图中用于表示计算逻辑的基本单元。它包含一系列操作（:code:`Operator`）和计算对象（:code:`Tensor`），支持顺序执行、条件选择和循环执行等控制结构，从而构建复杂的计算流程。
 

docs/api_guides/low_level/program_en.rst

@@ -16,9 +16,9 @@ In PaddlePaddle, a Program is a static graph model, similar to programs in other
 
 * Execute: An executor is invoked to obtain the computation results.
 
-This approach allows for efficient execution but requires the entire network structure to be defined before running the program. 
+This approach allows for efficient execution but requires the entire network structure to be defined before running the program.
 
-* A :code:`Program` consists of nested :code:`Blocks`. The concept of a :code:`Block` can be likened to a pair of curly braces ``{}`` in languages like C++ or Java, or to an indented block in Python. 
+* A :code:`Program` consists of nested :code:`Blocks`. The concept of a :code:`Block` can be likened to a pair of curly braces ``{}`` in languages like C++ or Java, or to an indented block in Python.
 
 * The computation in the :code:`Block` is composed of three types of execution: sequential execution, conditional selection, and loop execution, which together form a complex computational logic.