Fix two epydoc RST warnings.

$ epydoc -v -o ~/api -u http://biopython.org -n Biopython Bio/GenBank/__init__.py
+------------------------------------------------------------------------------------------------------------------------------------------------
| File /mnt/shared/users/pc40583/repositories/biopython/Bio/GenBank/__init__.py, line 612, in Bio.GenBank._FeatureConsumer
|   Warning: Line 618: Bullet list ends without a blank line; unexpected unindent.
|
+------------------------------------------------------------------------------------------------------------------------------------------------
| File /mnt/shared/users/pc40583/repositories/biopython/Bio/GenBank/__init__.py, line 737, in Bio.GenBank._FeatureConsumer.dblink
|   Warning: Line 760: Literal block expected; none found.
|
Tweak docstrings; fix epydoc RST warnings

$ epydoc -v -o ~/api -u http://biopython.org -n Biopython Bio/AlignIO/PhylipIO.py
+------------------------------------------------------------------------------------------------------------------------------------------------
| File /mnt/shared/users/pc40583/repositories/biopython/Bio/AlignIO/PhylipIO.py, line 6, in Bio.AlignIO.PhylipIO
|   Warning: Lines 14, 16, 28: Improper paragraph indentation.
|
+------------------------------------------------------------------------------------------------------------------------------------------------
| File /mnt/shared/users/pc40583/repositories/biopython/Bio/AlignIO/PhylipIO.py, line 178, in Bio.AlignIO.PhylipIO.PhylipIterator._split_id
|   Warning: Line 182: Improper paragraph indentation.
|
+------------------------------------------------------------------------------------------------------------------------------------------------
| File /mnt/shared/users/pc40583/repositories/biopython/Bio/AlignIO/PhylipIO.py, line 301, in
| Bio.AlignIO.PhylipIO.RelaxedPhylipIterator._split_id
|   Warning: Line 305: Improper paragraph indentation.
|
Fix epydoc RST warning from docstring

$ epydoc -v -o ~/api -u http://biopython.org -n Biopython Bio/AlignIO/NexusIO.py
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| File /mnt/shared/users/pc40583/repositories/biopython/Bio/AlignIO/NexusIO.py, line 72, in Bio.AlignIO.NexusIO.NexusWriter.write_file
|   Warning: Line 75: Improper paragraph indentation.
|
Fix epydoc RST warning, 'Lists must be indented'
Remove excess white space in docstrings; fix epydoc RST warning
Use literal blocks for RST markup
Change docstring bullet point character to match epydoc RST
Fix epydoc RST indentation warnings

$ epydoc -v -o ~/api -u http://biopython.org -n Biopython Bio/SeqIO/FastaIO.py
+------------------------------------------------------------------------------------------------------------------------------------------------
| File /mnt/shared/users/pc40583/repositories/biopython/Bio/SeqIO/FastaIO.py, line 135, in Bio.SeqIO.FastaIO.FastaWriter.__init__
|   Warning: Lines 138, 140, 144, 158: Improper paragraph indentation.
|
Fix epydoc RST indentation warnings