Update integer_na.rst with multiple improvements. (#51907)

* Update integer_na.rst

updating and improving multiple problems in the documentation.

* Update integer_na.rst

Author: Aryasarkar008

doc/source/user_guide/integer_na.rst

@@ -32,7 +32,7 @@ implemented within pandas.
    arr = pd.array([1, 2, None], dtype=pd.Int64Dtype())
    arr
 
-Or the string alias ``"Int64"`` (note the capital ``"I"``, to differentiate from
+Or the string alias ``"Int64"`` (note the capital ``"I"``) to differentiate from
 NumPy's ``'int64'`` dtype:
 
 .. ipython:: python
@@ -67,7 +67,7 @@ with the dtype.
       pd.array([1, 2])
 
    For backwards-compatibility, :class:`Series` infers these as either
-   integer or float dtype
+   integer or float dtype.
 
    .. ipython:: python
 
@@ -101,7 +101,7 @@ dtype if needed.
    # comparison
    s == 1
 
-   # indexing
+   # slicing operation
    s.iloc[1:3]
 
    # operate with other dtypes
@@ -110,7 +110,7 @@ dtype if needed.
    # coerce when needed
    s + 0.01
 
-These dtypes can operate as part of ``DataFrame``.
+These dtypes can operate as part of a ``DataFrame``.
 
 .. ipython:: python
 
@@ -119,7 +119,7 @@ These dtypes can operate as part of ``DataFrame``.
    df.dtypes
 
 
-These dtypes can be merged & reshaped & casted.
+These dtypes can be merged, reshaped & casted.
 
 .. ipython:: python