DOC: lreshape and wide_to_long references

[tpanza]

Location of the documentation

• General functions: Does not list lreshape
• DataFrame reshaping, sorting, transposing: Does not list lreshape or wide_to_long
• pd.melt: Does not list lreshape or wide_to_long in the "See Also" section
• pd.pivot: Include more related functions in the "See Also" section
• pd.pivot_table: Include more related functions in the "See Also" section
• pd.wide_to_long: Does not have a "See Also" section
• pd.lreshape: Does not exist

Documentation problem

There remains an outstanding question as to whether lreshape and/or wide_to_long should be deprecated/removed (#15003). Until that question is resolved, the pandas documentation should include lreshape and wide_to_long.

More links to and between the related pivoting/melting functions should be included in their respective "See Also" sections of their docstrings.

Suggested fix for documentation

Fairly self-explanatory. PR will contain the suggested additions.