Some minor typos fixed in padic docs.
Some minor typos fixed in padic docs.

dsroche/flint2,fredrik-johansson/flint2,dsroche/flint2,jpflori/flint2,wbhart/flint2,jpflori/flint2,wbhart/flint2,jpflori/flint2,jpflori/flint2,dsroche/flint2,fredrik-johansson/flint2,fredrik-johansson/flint2,wbhart/flint2,dsroche/flint2