Fix documentation (docstrings and RST)

[penguinolog]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 199

• 10 of 10 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 99.582%

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Totals
Change from base Build 198:	0.002%
Covered Lines:	954
Relevant Lines:	958

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 199

• 10 of 10 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 99.582%

---

Totals
Change from base Build 198:	0.002%
Covered Lines:	954
Relevant Lines:	958

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 199

• 10 of 10 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 99.582%

---

Totals
Change from base Build 198:	0.002%
Covered Lines:	954
Relevant Lines:	958

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 201

• 13 of 13 (100.0%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 99.582%

---

Totals
Change from base Build 198:	0.002%
Covered Lines:	954
Relevant Lines:	958

---

💛 - Coveralls