Typo fixes in doc

doc/install_ubuntu.txt

@@ -167,7 +167,7 @@ yourself. Here is some code that will help you.
     make FC=gfortran
     sudo make PREFIX=/usr/local/ install
     # Tell Theano to use OpenBLAS.
-    # This work only for the current user.
+    # This works only for the current user.
     # Each Theano user on that computer should run that line.
     echo -e "\n[blas]\nldflags = -lopenblas\n" >> ~/.theanorc
 

theano/scalar/basic.py

@@ -71,9 +71,9 @@ def upcast(dtype, *dtypes):
 
 def get_scalar_type(dtype):
     """
-    Return an Scalar(dtype) object.
+    Return a Scalar(dtype) object.
 
-    This cache objects to save allocation and run time.
+    This caches objects to save allocation and run time.
     """
     if dtype not in get_scalar_type.cache:
         get_scalar_type.cache[dtype] = Scalar(dtype=dtype)