DOC: Weird documentation (or behavior) of pd.read_csv escapechar= arg
#### Problem description

Documentation of pandas.read_csv states:

```
escapechar : str (length 1), default None

    One-character string used to escape delimiter when quoting is QUOTE_NONE.
```

But in reality you can correctly parse following CSV:

```
id, name
1, "Hello, my name is \"John\""
```

using this code:

```python
import pandas as pd

df=pd.read_csv("john.csv", quotechar='"', escapechar="\\")
print(df.name) # prints Hello, my name is "John"
print(df.id) # prints 1
```

Also same doc states that default quoting is QUOTE_MINIMAL, not QUOTE_NONE in example above.

Trying same with quoting=csv.QUOTE_NONE will give you incorrect result:

```python
import pandas as pd
import csv

df=pd.read_csv("john.csv", quotechar='"', escapechar="\\", quoting=csv.QUOTE_NONE)
print(df.name) # prints my name is John""
print(df.id) # prints 1, "Hello
```

Trying same without escapechar will also give you incorrect result:

```python
import pandas as pd

df=pd.read_csv("john.csv", quotechar='"')
print(df.name) # prints Hello, my name is \John\""
print(df.id) # prints 1
```

Looks like doc is misleading here, incorrectly stating that escapechar is used only for QUOTE_NONE when in fact it can be used with default mode (maybe as result of some bugfixes?)