fix typo error

doc/doc_ch/add_new_algorithm.md

@@ -95,7 +95,7 @@ class MyBackbone(nn.Layer):
         self.conv = nn.xxxx
 
     def forward(self, inputs):
-        # your necwork forward
+        # your network forward
         y = self.conv(inputs)
         return y
 ```
@@ -300,4 +300,4 @@ Optimizer:
   regularizer:
     name: 'L2'
     factor: 0
-```
+```

doc/doc_en/add_new_algorithm_en.md

@@ -96,7 +96,7 @@ class MyBackbone(nn.Layer):
         self.conv = nn.xxxx
 
     def forward(self, inputs):
-        # your necwork forward
+        # your network forward
         y = self.conv(inputs)
         return y
 ```
@@ -301,4 +301,4 @@ Optimizer:
   regularizer:
     name: 'L2'
     factor: 0
-```
+```