docs: fix typo (#1526)

Author: hongriTianqi

docs/advanced/elec_properties/band.md

@@ -1,6 +1,6 @@
 # Extracting Band Structure
 
-ABACUS can calculate the energy band structure, and the exampples can be found in [examples/band](https://github.com/deepmodeling/abacus-develop/tree/develop/examples/band).\
+ABACUS can calculate the energy band structure, and the examples can be found in [examples/band](https://github.com/deepmodeling/abacus-develop/tree/develop/examples/band).\
 Similar to the [DOS case](https://abacus-rtd.readthedocs.io/en/latest/advanced/elec_properties/dos.html), we first, do a ground-state energy calculation ***with one additional keyword "[out_chg](https://abacus-rtd.readthedocs.io/en/latest/advanced/input_files/input-main.html#out-chg)" in the INPUT file***:
 
 ```
@@ -88,4 +88,4 @@ The rest of the files arranged in sections, each section with a header such as b
 
 ```
 
-The shape of text contents of element <data> is (Number of k-points, Number of bands) 
+The shape of text contents of element <data> is (Number of k-points, Number of bands) 

docs/advanced/elec_properties/dos.md

@@ -2,7 +2,7 @@
 
 ## DOS
 
-ABACUS can calculate the density of states (DOS) of the system, and the exampples can be found in [examples/dos](https://github.com/deepmodeling/abacus-develop/tree/develop/examples/dos).\
+ABACUS can calculate the density of states (DOS) of the system, and the examples can be found in [examples/dos](https://github.com/deepmodeling/abacus-develop/tree/develop/examples/dos).\
 We first, do a ground-state energy calculation ***with one additional keyword "[out_chg](https://abacus-rtd.readthedocs.io/en/latest/advanced/input_files/input-main.html#out-chg)" in the INPUT file***:
 
 ```
@@ -118,4 +118,4 @@ The rest of the fileis arranged in sections, each section with a header such as
 </data>
 
 ```
-which tells the atom and symmetry of the current atomic orbital, and followed by the PDOS values. The values can thus be plotted against the energies. The unit of PDOS is also `(number of states)/(eV * unitcell)`.
+which tells the atom and symmetry of the current atomic orbital, and followed by the PDOS values. The values can thus be plotted against the energies. The unit of PDOS is also `(number of states)/(eV * unitcell)`.

docs/advanced/input_files/input-main.md

@@ -1010,7 +1010,7 @@ This part of variables are used to control the calculation of DOS.
 
 - **Type**: Real
 - **Description**: controls the step size in writing DOS (in eV).
-- **Default**: 0.1
+- **Default**: 0.01
 
 ### dos_sigma