DOC: Fix capitalization among headings in documentation files (#32550) (#32978)

* DOC: Fix capitalization among headings in documentation files (#32550)

* Update policies.rst

* Update roadmap.rst

* Update roadmap.rst

* Update comparison_with_sql.rst

Author: themien

doc/source/ecosystem.rst

@@ -5,7 +5,7 @@
 {{ header }}
 
 ****************
-Pandas ecosystem
+pandas ecosystem
 ****************
 
 Increasingly, packages are being built on top of pandas to address specific needs

doc/source/getting_started/comparison/comparison_with_sas.rst

@@ -698,7 +698,7 @@ In pandas this would be written as:
    tips.groupby(['sex', 'smoker']).first()
 
 
-Other Considerations
+Other considerations
 --------------------
 
 Disk vs memory
@@ -752,4 +752,4 @@ to interop data between SAS and pandas is to serialize to csv.
    Wall time: 14.6 s
 
    In [9]: %time df = pd.read_csv('big.csv')
-   Wall time: 4.86 s
+   Wall time: 4.86 s

doc/source/getting_started/comparison/comparison_with_sql.rst

@@ -388,10 +388,10 @@ In pandas, you can use :meth:`~pandas.concat` in conjunction with
 
     pd.concat([df1, df2]).drop_duplicates()
 
-Pandas equivalents for some SQL analytic and aggregate functions
+pandas equivalents for some SQL analytic and aggregate functions
 ----------------------------------------------------------------
 
-Top N rows with offset
+Top n rows with offset
 ~~~~~~~~~~~~~~~~~~~~~~
 
 .. code-block:: sql
@@ -405,7 +405,7 @@ Top N rows with offset
 
     tips.nlargest(10 + 5, columns='tip').tail(10)
 
-Top N rows per group
+Top n rows per group
 ~~~~~~~~~~~~~~~~~~~~
 
 .. code-block:: sql