Small improvements

Author: FrancescAlted

doc/getting_started/tutorials/02.lazyarray-expressions.ipynb

@@ -230,7 +230,7 @@
   {
    "cell_type": "markdown",
    "metadata": {},
-   "source": "Finally, you can save literal expressions to disk (and only computed results).  For this, use the `save` method of ``LazyArray`` objects.  For example, let's save the expression `c` to disk:"
+   "source": "You can save literal expressions to disk (and only computed results).  For this, use the `save` method of ``LazyArray`` objects.  For example, let's save the expression `c` to disk:"
   },
   {
    "cell_type": "code",
@@ -677,7 +677,7 @@
   {
    "cell_type": "markdown",
    "metadata": {},
-   "source": "We can also perform reductions on queries on a single field:"
+   "source": "And perform reductions on queries on a single field:"
   },
   {
    "cell_type": "code",
@@ -707,7 +707,7 @@
   {
    "cell_type": "markdown",
    "metadata": {},
-   "source": "Finally, we can perform more complex queries using the `where()` function.  For example, let's sum all the rows with the maximum of field `A` or field `B`:"
+   "source": "Finally, more complex queries can be done using the `where()` function.  For example, let's sum all the rows with the maximum of field `A` or field `B`:"
   },
   {
    "cell_type": "code",
@@ -737,7 +737,7 @@
   {
    "cell_type": "markdown",
    "metadata": {},
-   "source": "Combining all this weaponry allows to query your data on a simple and efficient way. As the computation is lazy, all the operations are grouped and executed together for maximum performance. The only exception is that, when a reduction is found, it is computed eagerly, but it still can be part of more general expressions, as well as being able to be saved and loaded from disk."
+   "source": "Combining all this weaponry allows to query your data on a simple and efficient way. As the computation is lazy, all the operations are grouped and executed together for maximum performance. The only exception is that, when a reduction is found, it is computed eagerly, but it can still be part of more general expressions, as well as being able to be saved and loaded from disk."
   },
   {
    "cell_type": "markdown",